A:
Positive:
1 x 212506455 x 425012913 x 163466519 x 111845565 x 32693395 x 223691247 x 860351235 x 17207
Negative:
-1 x -21250645-5 x -4250129-13 x -1634665-19 x -1118455-65 x -326933-95 x -223691-247 x -86035-1235 x -17207
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 21,250,645, 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 | 21,250,645 | |
| -1 | -21,250,645 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,250,645.
Example:
1 x 21,250,645 = 21,250,645
and
-1 x -21,250,645 = 21,250,645
Notice both answers equal 21,250,645
With that explanation out of the way, let's continue. Next, we take the number 21,250,645 and divide it by 2:
21,250,645 ÷ 2 = 10,625,322.5
If the quotient is a whole number, then 2 and 10,625,322.5 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 | 21,250,645 | |
| -1 | -21,250,645 |
Now, we try dividing 21,250,645 by 3:
21,250,645 ÷ 3 = 7,083,548.3333
If the quotient is a whole number, then 3 and 7,083,548.3333 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 | 21,250,645 | |
| -1 | -21,250,645 |
Let's try dividing by 4:
21,250,645 ÷ 4 = 5,312,661.25
If the quotient is a whole number, then 4 and 5,312,661.25 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 | 21,250,645 | |
| -1 | 21,250,645 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 19 | 65 | 95 | 247 | 1,235 | 17,207 | 86,035 | 223,691 | 326,933 | 1,118,455 | 1,634,665 | 4,250,129 | 21,250,645 |
| -1 | -5 | -13 | -19 | -65 | -95 | -247 | -1,235 | -17,207 | -86,035 | -223,691 | -326,933 | -1,118,455 | -1,634,665 | -4,250,129 | -21,250,645 |
Here are some more numbers to try:
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