A:
Positive:
1 x 211020355 x 422040743 x 49074561 x 345935215 x 98149305 x 691871609 x 131152623 x 8045
Negative:
-1 x -21102035-5 x -4220407-43 x -490745-61 x -345935-215 x -98149-305 x -69187-1609 x -13115-2623 x -8045
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 21,102,035, 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 | 21,102,035 | |
| -1 | -21,102,035 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,102,035.
Example:
1 x 21,102,035 = 21,102,035
and
-1 x -21,102,035 = 21,102,035
Notice both answers equal 21,102,035
With that explanation out of the way, let's continue. Next, we take the number 21,102,035 and divide it by 2:
21,102,035 ÷ 2 = 10,551,017.5
If the quotient is a whole number, then 2 and 10,551,017.5 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 | 21,102,035 | |
| -1 | -21,102,035 |
Now, we try dividing 21,102,035 by 3:
21,102,035 ÷ 3 = 7,034,011.6667
If the quotient is a whole number, then 3 and 7,034,011.6667 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 | 21,102,035 | |
| -1 | -21,102,035 |
Let's try dividing by 4:
21,102,035 ÷ 4 = 5,275,508.75
If the quotient is a whole number, then 4 and 5,275,508.75 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 | 21,102,035 | |
| -1 | 21,102,035 |
If you did it right, you will end up with this table:
| 1 | 5 | 43 | 61 | 215 | 305 | 1,609 | 2,623 | 8,045 | 13,115 | 69,187 | 98,149 | 345,935 | 490,745 | 4,220,407 | 21,102,035 |
| -1 | -5 | -43 | -61 | -215 | -305 | -1,609 | -2,623 | -8,045 | -13,115 | -69,187 | -98,149 | -345,935 | -490,745 | -4,220,407 | -21,102,035 |
Here are some more numbers to try:
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