A:
Positive:
1 x 215135455 x 430270943 x 50031547 x 457735215 x 100063235 x 915472021 x 106452129 x 10105
Negative:
-1 x -21513545-5 x -4302709-43 x -500315-47 x -457735-215 x -100063-235 x -91547-2021 x -10645-2129 x -10105
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 21,513,545, 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 | 21,513,545 | |
| -1 | -21,513,545 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,513,545.
Example:
1 x 21,513,545 = 21,513,545
and
-1 x -21,513,545 = 21,513,545
Notice both answers equal 21,513,545
With that explanation out of the way, let's continue. Next, we take the number 21,513,545 and divide it by 2:
21,513,545 ÷ 2 = 10,756,772.5
If the quotient is a whole number, then 2 and 10,756,772.5 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 | 21,513,545 | |
| -1 | -21,513,545 |
Now, we try dividing 21,513,545 by 3:
21,513,545 ÷ 3 = 7,171,181.6667
If the quotient is a whole number, then 3 and 7,171,181.6667 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 | 21,513,545 | |
| -1 | -21,513,545 |
Let's try dividing by 4:
21,513,545 ÷ 4 = 5,378,386.25
If the quotient is a whole number, then 4 and 5,378,386.25 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 | 21,513,545 | |
| -1 | 21,513,545 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 47 | 215 | 235 | 2,021 | 2,129 | 10,105 | 10,645 | 91,547 | 100,063 | 457,735 | 500,315 | 4,302,709 | 21,513,545 |
| -1 | -5 | -43 | -47 | -215 | -235 | -2,021 | -2,129 | -10,105 | -10,645 | -91,547 | -100,063 | -457,735 | -500,315 | -4,302,709 | -21,513,545 |
Here are some more numbers to try:
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