A:
Positive:
1 x 215234455 x 430468917 x 126608585 x 253217313 x 68765809 x 266051565 x 137534045 x 5321
Negative:
-1 x -21523445-5 x -4304689-17 x -1266085-85 x -253217-313 x -68765-809 x -26605-1565 x -13753-4045 x -5321
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 21,523,445, 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 | 21,523,445 | |
| -1 | -21,523,445 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,523,445.
Example:
1 x 21,523,445 = 21,523,445
and
-1 x -21,523,445 = 21,523,445
Notice both answers equal 21,523,445
With that explanation out of the way, let's continue. Next, we take the number 21,523,445 and divide it by 2:
21,523,445 ÷ 2 = 10,761,722.5
If the quotient is a whole number, then 2 and 10,761,722.5 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 | 21,523,445 | |
| -1 | -21,523,445 |
Now, we try dividing 21,523,445 by 3:
21,523,445 ÷ 3 = 7,174,481.6667
If the quotient is a whole number, then 3 and 7,174,481.6667 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 | 21,523,445 | |
| -1 | -21,523,445 |
Let's try dividing by 4:
21,523,445 ÷ 4 = 5,380,861.25
If the quotient is a whole number, then 4 and 5,380,861.25 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 | 21,523,445 | |
| -1 | 21,523,445 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 313 | 809 | 1,565 | 4,045 | 5,321 | 13,753 | 26,605 | 68,765 | 253,217 | 1,266,085 | 4,304,689 | 21,523,445 |
| -1 | -5 | -17 | -85 | -313 | -809 | -1,565 | -4,045 | -5,321 | -13,753 | -26,605 | -68,765 | -253,217 | -1,266,085 | -4,304,689 | -21,523,445 |
Here are some more numbers to try:
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