A:
Positive:
1 x 213052455 x 426104913 x 163886523 x 92631565 x 327773115 x 185263299 x 712551495 x 14251
Negative:
-1 x -21305245-5 x -4261049-13 x -1638865-23 x -926315-65 x -327773-115 x -185263-299 x -71255-1495 x -14251
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 21,305,245, 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 | 21,305,245 | |
| -1 | -21,305,245 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,305,245.
Example:
1 x 21,305,245 = 21,305,245
and
-1 x -21,305,245 = 21,305,245
Notice both answers equal 21,305,245
With that explanation out of the way, let's continue. Next, we take the number 21,305,245 and divide it by 2:
21,305,245 ÷ 2 = 10,652,622.5
If the quotient is a whole number, then 2 and 10,652,622.5 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 | 21,305,245 | |
| -1 | -21,305,245 |
Now, we try dividing 21,305,245 by 3:
21,305,245 ÷ 3 = 7,101,748.3333
If the quotient is a whole number, then 3 and 7,101,748.3333 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 | 21,305,245 | |
| -1 | -21,305,245 |
Let's try dividing by 4:
21,305,245 ÷ 4 = 5,326,311.25
If the quotient is a whole number, then 4 and 5,326,311.25 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 | 21,305,245 | |
| -1 | 21,305,245 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 23 | 65 | 115 | 299 | 1,495 | 14,251 | 71,255 | 185,263 | 327,773 | 926,315 | 1,638,865 | 4,261,049 | 21,305,245 |
| -1 | -5 | -13 | -23 | -65 | -115 | -299 | -1,495 | -14,251 | -71,255 | -185,263 | -327,773 | -926,315 | -1,638,865 | -4,261,049 | -21,305,245 |
Here are some more numbers to try:
Try the factor calculator