Q: What are the factor combinations of the number 21,015,126?

 A:
Positive:   1 x 210151262 x 105075633 x 70050426 x 35025219 x 233501411 x 191046618 x 116750722 x 95523327 x 77833833 x 63682254 x 38916966 x 31841181 x 25944699 x 212274162 x 129723198 x 106137243 x 86482297 x 70758486 x 43241594 x 35379891 x 235861782 x 117932673 x 78623931 x 5346
Negative: -1 x -21015126-2 x -10507563-3 x -7005042-6 x -3502521-9 x -2335014-11 x -1910466-18 x -1167507-22 x -955233-27 x -778338-33 x -636822-54 x -389169-66 x -318411-81 x -259446-99 x -212274-162 x -129723-198 x -106137-243 x -86482-297 x -70758-486 x -43241-594 x -35379-891 x -23586-1782 x -11793-2673 x -7862-3931 x -5346


How do I find the factor combinations of the number 21,015,126?

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 21,015,126, 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 21,015,126
-1 -21,015,126

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 21,015,126.

Example:
1 x 21,015,126 = 21,015,126
and
-1 x -21,015,126 = 21,015,126
Notice both answers equal 21,015,126

With that explanation out of the way, let's continue. Next, we take the number 21,015,126 and divide it by 2:

21,015,126 ÷ 2 = 10,507,563

If the quotient is a whole number, then 2 and 10,507,563 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 10,507,563 21,015,126
-1 -2 -10,507,563 -21,015,126

Now, we try dividing 21,015,126 by 3:

21,015,126 ÷ 3 = 7,005,042

If the quotient is a whole number, then 3 and 7,005,042 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 3 7,005,042 10,507,563 21,015,126
-1 -2 -3 -7,005,042 -10,507,563 -21,015,126

Let's try dividing by 4:

21,015,126 ÷ 4 = 5,253,781.5

If the quotient is a whole number, then 4 and 5,253,781.5 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 3 7,005,042 10,507,563 21,015,126
-1 -2 -3 -7,005,042 -10,507,563 21,015,126
Keep dividing by the next highest number until you cannot divide anymore.

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

123691118222733546681991621982432974865948911,7822,6733,9315,3467,86211,79323,58635,37943,24170,75886,482106,137129,723212,274259,446318,411389,169636,822778,338955,2331,167,5071,910,4662,335,0143,502,5217,005,04210,507,56321,015,126
-1-2-3-6-9-11-18-22-27-33-54-66-81-99-162-198-243-297-486-594-891-1,782-2,673-3,931-5,346-7,862-11,793-23,586-35,379-43,241-70,758-86,482-106,137-129,723-212,274-259,446-318,411-389,169-636,822-778,338-955,233-1,167,507-1,910,466-2,335,014-3,502,521-7,005,042-10,507,563-21,015,126

More Examples

Here are some more numbers to try:

21,015,12421,015,12521,015,12721,015,128
Try the factor calculator

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