A:
Positive:
1 x 215132055 x 43026417 x 307331535 x 61466349 x 439045245 x 87809277 x 77665317 x 678651385 x 155331585 x 135731939 x 110952219 x 9695
Negative:
-1 x -21513205-5 x -4302641-7 x -3073315-35 x -614663-49 x -439045-245 x -87809-277 x -77665-317 x -67865-1385 x -15533-1585 x -13573-1939 x -11095-2219 x -9695
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 21,513,205, 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 | 21,513,205 | |
| -1 | -21,513,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,513,205.
Example:
1 x 21,513,205 = 21,513,205
and
-1 x -21,513,205 = 21,513,205
Notice both answers equal 21,513,205
With that explanation out of the way, let's continue. Next, we take the number 21,513,205 and divide it by 2:
21,513,205 ÷ 2 = 10,756,602.5
If the quotient is a whole number, then 2 and 10,756,602.5 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 | 21,513,205 | |
| -1 | -21,513,205 |
Now, we try dividing 21,513,205 by 3:
21,513,205 ÷ 3 = 7,171,068.3333
If the quotient is a whole number, then 3 and 7,171,068.3333 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 | 21,513,205 | |
| -1 | -21,513,205 |
Let's try dividing by 4:
21,513,205 ÷ 4 = 5,378,301.25
If the quotient is a whole number, then 4 and 5,378,301.25 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 | 21,513,205 | |
| -1 | 21,513,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 245 | 277 | 317 | 1,385 | 1,585 | 1,939 | 2,219 | 9,695 | 11,095 | 13,573 | 15,533 | 67,865 | 77,665 | 87,809 | 439,045 | 614,663 | 3,073,315 | 4,302,641 | 21,513,205 |
| -1 | -5 | -7 | -35 | -49 | -245 | -277 | -317 | -1,385 | -1,585 | -1,939 | -2,219 | -9,695 | -11,095 | -13,573 | -15,533 | -67,865 | -77,665 | -87,809 | -439,045 | -614,663 | -3,073,315 | -4,302,641 | -21,513,205 |
Here are some more numbers to try:
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