A:
Positive:
1 x 213312555 x 426625111 x 193920531 x 68810555 x 387841155 x 137621341 x 625551705 x 12511
Negative:
-1 x -21331255-5 x -4266251-11 x -1939205-31 x -688105-55 x -387841-155 x -137621-341 x -62555-1705 x -12511
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 21,331,255, 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 | 21,331,255 | |
| -1 | -21,331,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,331,255.
Example:
1 x 21,331,255 = 21,331,255
and
-1 x -21,331,255 = 21,331,255
Notice both answers equal 21,331,255
With that explanation out of the way, let's continue. Next, we take the number 21,331,255 and divide it by 2:
21,331,255 ÷ 2 = 10,665,627.5
If the quotient is a whole number, then 2 and 10,665,627.5 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 | 21,331,255 | |
| -1 | -21,331,255 |
Now, we try dividing 21,331,255 by 3:
21,331,255 ÷ 3 = 7,110,418.3333
If the quotient is a whole number, then 3 and 7,110,418.3333 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 | 21,331,255 | |
| -1 | -21,331,255 |
Let's try dividing by 4:
21,331,255 ÷ 4 = 5,332,813.75
If the quotient is a whole number, then 4 and 5,332,813.75 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 | 21,331,255 | |
| -1 | 21,331,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 31 | 55 | 155 | 341 | 1,705 | 12,511 | 62,555 | 137,621 | 387,841 | 688,105 | 1,939,205 | 4,266,251 | 21,331,255 |
| -1 | -5 | -11 | -31 | -55 | -155 | -341 | -1,705 | -12,511 | -62,555 | -137,621 | -387,841 | -688,105 | -1,939,205 | -4,266,251 | -21,331,255 |
Here are some more numbers to try:
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