A:
Positive:
1 x 213156655 x 42631337 x 304509535 x 609019131 x 162715655 x 32543917 x 232454585 x 4649
Negative:
-1 x -21315665-5 x -4263133-7 x -3045095-35 x -609019-131 x -162715-655 x -32543-917 x -23245-4585 x -4649
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 21,315,665, 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 | 21,315,665 | |
| -1 | -21,315,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,315,665.
Example:
1 x 21,315,665 = 21,315,665
and
-1 x -21,315,665 = 21,315,665
Notice both answers equal 21,315,665
With that explanation out of the way, let's continue. Next, we take the number 21,315,665 and divide it by 2:
21,315,665 ÷ 2 = 10,657,832.5
If the quotient is a whole number, then 2 and 10,657,832.5 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 | 21,315,665 | |
| -1 | -21,315,665 |
Now, we try dividing 21,315,665 by 3:
21,315,665 ÷ 3 = 7,105,221.6667
If the quotient is a whole number, then 3 and 7,105,221.6667 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 | 21,315,665 | |
| -1 | -21,315,665 |
Let's try dividing by 4:
21,315,665 ÷ 4 = 5,328,916.25
If the quotient is a whole number, then 4 and 5,328,916.25 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 | 21,315,665 | |
| -1 | 21,315,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 131 | 655 | 917 | 4,585 | 4,649 | 23,245 | 32,543 | 162,715 | 609,019 | 3,045,095 | 4,263,133 | 21,315,665 |
| -1 | -5 | -7 | -35 | -131 | -655 | -917 | -4,585 | -4,649 | -23,245 | -32,543 | -162,715 | -609,019 | -3,045,095 | -4,263,133 | -21,315,665 |
Here are some more numbers to try:
Try the factor calculator