Q: What are the factor combinations of the number 21,021,920?

 A:
Positive:   1 x 210219202 x 105109604 x 52554805 x 42043848 x 262774010 x 210219216 x 131387020 x 105109632 x 65693537 x 56816040 x 52554853 x 39664067 x 31376074 x 28408080 x 262774106 x 198320134 x 156880148 x 142040160 x 131387185 x 113632212 x 99160265 x 79328268 x 78440296 x 71020335 x 62752370 x 56816424 x 49580530 x 39664536 x 39220592 x 35510670 x 31376740 x 28408848 x 247901060 x 198321072 x 196101184 x 177551340 x 156881480 x 142041696 x 123951961 x 107202120 x 99162144 x 98052479 x 84802680 x 78442960 x 71023551 x 59203922 x 53604240 x 4958
Negative: -1 x -21021920-2 x -10510960-4 x -5255480-5 x -4204384-8 x -2627740-10 x -2102192-16 x -1313870-20 x -1051096-32 x -656935-37 x -568160-40 x -525548-53 x -396640-67 x -313760-74 x -284080-80 x -262774-106 x -198320-134 x -156880-148 x -142040-160 x -131387-185 x -113632-212 x -99160-265 x -79328-268 x -78440-296 x -71020-335 x -62752-370 x -56816-424 x -49580-530 x -39664-536 x -39220-592 x -35510-670 x -31376-740 x -28408-848 x -24790-1060 x -19832-1072 x -19610-1184 x -17755-1340 x -15688-1480 x -14204-1696 x -12395-1961 x -10720-2120 x -9916-2144 x -9805-2479 x -8480-2680 x -7844-2960 x -7102-3551 x -5920-3922 x -5360-4240 x -4958


How do I find the factor combinations of the number 21,021,920?

Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,021,920, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.

1 21,021,920
-1 -21,021,920

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,021,920.

Example:
1 x 21,021,920 = 21,021,920
and
-1 x -21,021,920 = 21,021,920
Notice both answers equal 21,021,920

With that explanation out of the way, let's continue. Next, we take the number 21,021,920 and divide it by 2:

21,021,920 ÷ 2 = 10,510,960

If the quotient is a whole number, then 2 and 10,510,960 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 10,510,960 21,021,920
-1 -2 -10,510,960 -21,021,920

Now, we try dividing 21,021,920 by 3:

21,021,920 ÷ 3 = 7,007,306.6667

If the quotient is a whole number, then 3 and 7,007,306.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.

Here is what our table should look like at this step:

1 2 10,510,960 21,021,920
-1 -2 -10,510,960 -21,021,920

Let's try dividing by 4:

21,021,920 ÷ 4 = 5,255,480

If the quotient is a whole number, then 4 and 5,255,480 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 4 5,255,480 10,510,960 21,021,920
-1 -2 -4 -5,255,480 -10,510,960 21,021,920
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

12458101620323740536774801061341481601852122652682963353704245305365926707408481,0601,0721,1841,3401,4801,6961,9612,1202,1442,4792,6802,9603,5513,9224,2404,9585,3605,9207,1027,8448,4809,8059,91610,72012,39514,20415,68817,75519,61019,83224,79028,40831,37635,51039,22039,66449,58056,81662,75271,02078,44079,32899,160113,632131,387142,040156,880198,320262,774284,080313,760396,640525,548568,160656,9351,051,0961,313,8702,102,1922,627,7404,204,3845,255,48010,510,96021,021,920
-1-2-4-5-8-10-16-20-32-37-40-53-67-74-80-106-134-148-160-185-212-265-268-296-335-370-424-530-536-592-670-740-848-1,060-1,072-1,184-1,340-1,480-1,696-1,961-2,120-2,144-2,479-2,680-2,960-3,551-3,922-4,240-4,958-5,360-5,920-7,102-7,844-8,480-9,805-9,916-10,720-12,395-14,204-15,688-17,755-19,610-19,832-24,790-28,408-31,376-35,510-39,220-39,664-49,580-56,816-62,752-71,020-78,440-79,328-99,160-113,632-131,387-142,040-156,880-198,320-262,774-284,080-313,760-396,640-525,548-568,160-656,935-1,051,096-1,313,870-2,102,192-2,627,740-4,204,384-5,255,480-10,510,960-21,021,920

More Examples

Here are some more numbers to try:

21,021,91821,021,91921,021,92121,021,922
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