A:
Positive:
1 x 213112137 x 304445911 x 193738359 x 36120777 x 276769413 x 51601649 x 328374543 x 4691
Negative:
-1 x -21311213-7 x -3044459-11 x -1937383-59 x -361207-77 x -276769-413 x -51601-649 x -32837-4543 x -4691
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 21,311,213, 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 | 21,311,213 | |
| -1 | -21,311,213 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,311,213.
Example:
1 x 21,311,213 = 21,311,213
and
-1 x -21,311,213 = 21,311,213
Notice both answers equal 21,311,213
With that explanation out of the way, let's continue. Next, we take the number 21,311,213 and divide it by 2:
21,311,213 ÷ 2 = 10,655,606.5
If the quotient is a whole number, then 2 and 10,655,606.5 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 | 21,311,213 | |
| -1 | -21,311,213 |
Now, we try dividing 21,311,213 by 3:
21,311,213 ÷ 3 = 7,103,737.6667
If the quotient is a whole number, then 3 and 7,103,737.6667 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 | 21,311,213 | |
| -1 | -21,311,213 |
Let's try dividing by 4:
21,311,213 ÷ 4 = 5,327,803.25
If the quotient is a whole number, then 4 and 5,327,803.25 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 | 21,311,213 | |
| -1 | 21,311,213 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 59 | 77 | 413 | 649 | 4,543 | 4,691 | 32,837 | 51,601 | 276,769 | 361,207 | 1,937,383 | 3,044,459 | 21,311,213 |
| -1 | -7 | -11 | -59 | -77 | -413 | -649 | -4,543 | -4,691 | -32,837 | -51,601 | -276,769 | -361,207 | -1,937,383 | -3,044,459 | -21,311,213 |
Here are some more numbers to try:
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