A:
Positive:
1 x 210310455 x 42062097 x 300443535 x 60088749 x 429205245 x 85841343 x 613151715 x 12263
Negative:
-1 x -21031045-5 x -4206209-7 x -3004435-35 x -600887-49 x -429205-245 x -85841-343 x -61315-1715 x -12263
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 21,031,045, 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 | 21,031,045 | |
| -1 | -21,031,045 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,031,045.
Example:
1 x 21,031,045 = 21,031,045
and
-1 x -21,031,045 = 21,031,045
Notice both answers equal 21,031,045
With that explanation out of the way, let's continue. Next, we take the number 21,031,045 and divide it by 2:
21,031,045 ÷ 2 = 10,515,522.5
If the quotient is a whole number, then 2 and 10,515,522.5 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 | 21,031,045 | |
| -1 | -21,031,045 |
Now, we try dividing 21,031,045 by 3:
21,031,045 ÷ 3 = 7,010,348.3333
If the quotient is a whole number, then 3 and 7,010,348.3333 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 | 21,031,045 | |
| -1 | -21,031,045 |
Let's try dividing by 4:
21,031,045 ÷ 4 = 5,257,761.25
If the quotient is a whole number, then 4 and 5,257,761.25 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 | 21,031,045 | |
| -1 | 21,031,045 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 245 | 343 | 1,715 | 12,263 | 61,315 | 85,841 | 429,205 | 600,887 | 3,004,435 | 4,206,209 | 21,031,045 |
| -1 | -5 | -7 | -35 | -49 | -245 | -343 | -1,715 | -12,263 | -61,315 | -85,841 | -429,205 | -600,887 | -3,004,435 | -4,206,209 | -21,031,045 |
Here are some more numbers to try:
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