A:
Positive:
1 x 210130255 x 420260511 x 191027525 x 84052143 x 48867555 x 382055215 x 97735275 x 76411473 x 444251075 x 195471777 x 118252365 x 8885
Negative:
-1 x -21013025-5 x -4202605-11 x -1910275-25 x -840521-43 x -488675-55 x -382055-215 x -97735-275 x -76411-473 x -44425-1075 x -19547-1777 x -11825-2365 x -8885
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 21,013,025, 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 | 21,013,025 | |
| -1 | -21,013,025 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,013,025.
Example:
1 x 21,013,025 = 21,013,025
and
-1 x -21,013,025 = 21,013,025
Notice both answers equal 21,013,025
With that explanation out of the way, let's continue. Next, we take the number 21,013,025 and divide it by 2:
21,013,025 ÷ 2 = 10,506,512.5
If the quotient is a whole number, then 2 and 10,506,512.5 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 | 21,013,025 | |
| -1 | -21,013,025 |
Now, we try dividing 21,013,025 by 3:
21,013,025 ÷ 3 = 7,004,341.6667
If the quotient is a whole number, then 3 and 7,004,341.6667 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 | 21,013,025 | |
| -1 | -21,013,025 |
Let's try dividing by 4:
21,013,025 ÷ 4 = 5,253,256.25
If the quotient is a whole number, then 4 and 5,253,256.25 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 | 21,013,025 | |
| -1 | 21,013,025 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 25 | 43 | 55 | 215 | 275 | 473 | 1,075 | 1,777 | 2,365 | 8,885 | 11,825 | 19,547 | 44,425 | 76,411 | 97,735 | 382,055 | 488,675 | 840,521 | 1,910,275 | 4,202,605 | 21,013,025 |
| -1 | -5 | -11 | -25 | -43 | -55 | -215 | -275 | -473 | -1,075 | -1,777 | -2,365 | -8,885 | -11,825 | -19,547 | -44,425 | -76,411 | -97,735 | -382,055 | -488,675 | -840,521 | -1,910,275 | -4,202,605 | -21,013,025 |
Here are some more numbers to try:
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