A:
Positive:
1 x 21539746123 x 936510737 x 5821553127 x 1696043851 x 2531111993 x 1080772921 x 737414699 x 45839
Negative:
-1 x -215397461-23 x -9365107-37 x -5821553-127 x -1696043-851 x -253111-1993 x -108077-2921 x -73741-4699 x -45839
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 215,397,461, 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 | 215,397,461 | |
| -1 | -215,397,461 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,397,461.
Example:
1 x 215,397,461 = 215,397,461
and
-1 x -215,397,461 = 215,397,461
Notice both answers equal 215,397,461
With that explanation out of the way, let's continue. Next, we take the number 215,397,461 and divide it by 2:
215,397,461 ÷ 2 = 107,698,730.5
If the quotient is a whole number, then 2 and 107,698,730.5 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 | 215,397,461 | |
| -1 | -215,397,461 |
Now, we try dividing 215,397,461 by 3:
215,397,461 ÷ 3 = 71,799,153.6667
If the quotient is a whole number, then 3 and 71,799,153.6667 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 | 215,397,461 | |
| -1 | -215,397,461 |
Let's try dividing by 4:
215,397,461 ÷ 4 = 53,849,365.25
If the quotient is a whole number, then 4 and 53,849,365.25 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 | 215,397,461 | |
| -1 | 215,397,461 |
If you did it right, you will end up with this table:
| 1 | 23 | 37 | 127 | 851 | 1,993 | 2,921 | 4,699 | 45,839 | 73,741 | 108,077 | 253,111 | 1,696,043 | 5,821,553 | 9,365,107 | 215,397,461 |
| -1 | -23 | -37 | -127 | -851 | -1,993 | -2,921 | -4,699 | -45,839 | -73,741 | -108,077 | -253,111 | -1,696,043 | -5,821,553 | -9,365,107 | -215,397,461 |
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