A:
Positive:
1 x 215071017 x 307244311 x 195519137 x 58127377 x 279313259 x 83039407 x 528432849 x 7549
Negative:
-1 x -21507101-7 x -3072443-11 x -1955191-37 x -581273-77 x -279313-259 x -83039-407 x -52843-2849 x -7549
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 21,507,101, 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 | 21,507,101 | |
| -1 | -21,507,101 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,507,101.
Example:
1 x 21,507,101 = 21,507,101
and
-1 x -21,507,101 = 21,507,101
Notice both answers equal 21,507,101
With that explanation out of the way, let's continue. Next, we take the number 21,507,101 and divide it by 2:
21,507,101 ÷ 2 = 10,753,550.5
If the quotient is a whole number, then 2 and 10,753,550.5 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 | 21,507,101 | |
| -1 | -21,507,101 |
Now, we try dividing 21,507,101 by 3:
21,507,101 ÷ 3 = 7,169,033.6667
If the quotient is a whole number, then 3 and 7,169,033.6667 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 | 21,507,101 | |
| -1 | -21,507,101 |
Let's try dividing by 4:
21,507,101 ÷ 4 = 5,376,775.25
If the quotient is a whole number, then 4 and 5,376,775.25 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 | 21,507,101 | |
| -1 | 21,507,101 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 37 | 77 | 259 | 407 | 2,849 | 7,549 | 52,843 | 83,039 | 279,313 | 581,273 | 1,955,191 | 3,072,443 | 21,507,101 |
| -1 | -7 | -11 | -37 | -77 | -259 | -407 | -2,849 | -7,549 | -52,843 | -83,039 | -279,313 | -581,273 | -1,955,191 | -3,072,443 | -21,507,101 |
Here are some more numbers to try:
Try the factor calculator