A:
Positive:
1 x 1511622123 x 65722729 x 521249131 x 115391173 x 87377667 x 226633013 x 50173799 x 3979
Negative:
-1 x -15116221-23 x -657227-29 x -521249-131 x -115391-173 x -87377-667 x -22663-3013 x -5017-3799 x -3979
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 15,116,221, 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 | 15,116,221 | |
| -1 | -15,116,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,116,221.
Example:
1 x 15,116,221 = 15,116,221
and
-1 x -15,116,221 = 15,116,221
Notice both answers equal 15,116,221
With that explanation out of the way, let's continue. Next, we take the number 15,116,221 and divide it by 2:
15,116,221 ÷ 2 = 7,558,110.5
If the quotient is a whole number, then 2 and 7,558,110.5 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 | 15,116,221 | |
| -1 | -15,116,221 |
Now, we try dividing 15,116,221 by 3:
15,116,221 ÷ 3 = 5,038,740.3333
If the quotient is a whole number, then 3 and 5,038,740.3333 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 | 15,116,221 | |
| -1 | -15,116,221 |
Let's try dividing by 4:
15,116,221 ÷ 4 = 3,779,055.25
If the quotient is a whole number, then 4 and 3,779,055.25 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 | 15,116,221 | |
| -1 | 15,116,221 |
If you did it right, you will end up with this table:
| 1 | 23 | 29 | 131 | 173 | 667 | 3,013 | 3,799 | 3,979 | 5,017 | 22,663 | 87,377 | 115,391 | 521,249 | 657,227 | 15,116,221 |
| -1 | -23 | -29 | -131 | -173 | -667 | -3,013 | -3,799 | -3,979 | -5,017 | -22,663 | -87,377 | -115,391 | -521,249 | -657,227 | -15,116,221 |
Here are some more numbers to try:
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