A:
Positive:
1 x 215722155 x 43144437 x 308174535 x 616349419 x 514851471 x 146652095 x 102972933 x 7355
Negative:
-1 x -21572215-5 x -4314443-7 x -3081745-35 x -616349-419 x -51485-1471 x -14665-2095 x -10297-2933 x -7355
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 21,572,215, 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 | 21,572,215 | |
| -1 | -21,572,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,572,215.
Example:
1 x 21,572,215 = 21,572,215
and
-1 x -21,572,215 = 21,572,215
Notice both answers equal 21,572,215
With that explanation out of the way, let's continue. Next, we take the number 21,572,215 and divide it by 2:
21,572,215 ÷ 2 = 10,786,107.5
If the quotient is a whole number, then 2 and 10,786,107.5 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 | 21,572,215 | |
| -1 | -21,572,215 |
Now, we try dividing 21,572,215 by 3:
21,572,215 ÷ 3 = 7,190,738.3333
If the quotient is a whole number, then 3 and 7,190,738.3333 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 | 21,572,215 | |
| -1 | -21,572,215 |
Let's try dividing by 4:
21,572,215 ÷ 4 = 5,393,053.75
If the quotient is a whole number, then 4 and 5,393,053.75 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 | 21,572,215 | |
| -1 | 21,572,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 419 | 1,471 | 2,095 | 2,933 | 7,355 | 10,297 | 14,665 | 51,485 | 616,349 | 3,081,745 | 4,314,443 | 21,572,215 |
| -1 | -5 | -7 | -35 | -419 | -1,471 | -2,095 | -2,933 | -7,355 | -10,297 | -14,665 | -51,485 | -616,349 | -3,081,745 | -4,314,443 | -21,572,215 |
Here are some more numbers to try:
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