A:
Positive:
1 x 2104211355 x 4208422723 x 9148745115 x 1829749233 x 9030951165 x 1806195359 x 392657853 x 26795
Negative:
-1 x -210421135-5 x -42084227-23 x -9148745-115 x -1829749-233 x -903095-1165 x -180619-5359 x -39265-7853 x -26795
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 210,421,135, it is easier to work with a table - it's called factoring from the outside in.
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 | 210,421,135 | |
| -1 | -210,421,135 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,421,135.
Example:
1 x 210,421,135 = 210,421,135
and
-1 x -210,421,135 = 210,421,135
Notice both answers equal 210,421,135
With that explanation out of the way, let's continue. Next, we take the number 210,421,135 and divide it by 2:
210,421,135 ÷ 2 = 105,210,567.5
If the quotient is a whole number, then 2 and 105,210,567.5 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 | 210,421,135 | |
| -1 | -210,421,135 |
Now, we try dividing 210,421,135 by 3:
210,421,135 ÷ 3 = 70,140,378.3333
If the quotient is a whole number, then 3 and 70,140,378.3333 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 | 210,421,135 | |
| -1 | -210,421,135 |
Let's try dividing by 4:
210,421,135 ÷ 4 = 52,605,283.75
If the quotient is a whole number, then 4 and 52,605,283.75 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 | 210,421,135 | |
| -1 | 210,421,135 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 115 | 233 | 1,165 | 5,359 | 7,853 | 26,795 | 39,265 | 180,619 | 903,095 | 1,829,749 | 9,148,745 | 42,084,227 | 210,421,135 |
| -1 | -5 | -23 | -115 | -233 | -1,165 | -5,359 | -7,853 | -26,795 | -39,265 | -180,619 | -903,095 | -1,829,749 | -9,148,745 | -42,084,227 | -210,421,135 |
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