A:
Positive:
1 x 210881655 x 42176337 x 301259535 x 602519239 x 882351195 x 176471673 x 126052521 x 8365
Negative:
-1 x -21088165-5 x -4217633-7 x -3012595-35 x -602519-239 x -88235-1195 x -17647-1673 x -12605-2521 x -8365
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 21,088,165, 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 | 21,088,165 | |
| -1 | -21,088,165 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,088,165.
Example:
1 x 21,088,165 = 21,088,165
and
-1 x -21,088,165 = 21,088,165
Notice both answers equal 21,088,165
With that explanation out of the way, let's continue. Next, we take the number 21,088,165 and divide it by 2:
21,088,165 ÷ 2 = 10,544,082.5
If the quotient is a whole number, then 2 and 10,544,082.5 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 | 21,088,165 | |
| -1 | -21,088,165 |
Now, we try dividing 21,088,165 by 3:
21,088,165 ÷ 3 = 7,029,388.3333
If the quotient is a whole number, then 3 and 7,029,388.3333 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 | 21,088,165 | |
| -1 | -21,088,165 |
Let's try dividing by 4:
21,088,165 ÷ 4 = 5,272,041.25
If the quotient is a whole number, then 4 and 5,272,041.25 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 | 21,088,165 | |
| -1 | 21,088,165 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 239 | 1,195 | 1,673 | 2,521 | 8,365 | 12,605 | 17,647 | 88,235 | 602,519 | 3,012,595 | 4,217,633 | 21,088,165 |
| -1 | -5 | -7 | -35 | -239 | -1,195 | -1,673 | -2,521 | -8,365 | -12,605 | -17,647 | -88,235 | -602,519 | -3,012,595 | -4,217,633 | -21,088,165 |
Here are some more numbers to try:
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