A:
Positive:
1 x 215150117 x 307357319 x 113236983 x 259217133 x 161767581 x 370311577 x 136431949 x 11039
Negative:
-1 x -21515011-7 x -3073573-19 x -1132369-83 x -259217-133 x -161767-581 x -37031-1577 x -13643-1949 x -11039
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 21,515,011, 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 | 21,515,011 | |
| -1 | -21,515,011 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,515,011.
Example:
1 x 21,515,011 = 21,515,011
and
-1 x -21,515,011 = 21,515,011
Notice both answers equal 21,515,011
With that explanation out of the way, let's continue. Next, we take the number 21,515,011 and divide it by 2:
21,515,011 ÷ 2 = 10,757,505.5
If the quotient is a whole number, then 2 and 10,757,505.5 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 | 21,515,011 | |
| -1 | -21,515,011 |
Now, we try dividing 21,515,011 by 3:
21,515,011 ÷ 3 = 7,171,670.3333
If the quotient is a whole number, then 3 and 7,171,670.3333 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 | 21,515,011 | |
| -1 | -21,515,011 |
Let's try dividing by 4:
21,515,011 ÷ 4 = 5,378,752.75
If the quotient is a whole number, then 4 and 5,378,752.75 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 | 21,515,011 | |
| -1 | 21,515,011 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 83 | 133 | 581 | 1,577 | 1,949 | 11,039 | 13,643 | 37,031 | 161,767 | 259,217 | 1,132,369 | 3,073,573 | 21,515,011 |
| -1 | -7 | -19 | -83 | -133 | -581 | -1,577 | -1,949 | -11,039 | -13,643 | -37,031 | -161,767 | -259,217 | -1,132,369 | -3,073,573 | -21,515,011 |
Here are some more numbers to try:
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