A:
Positive:
1 x 215553255 x 431106511 x 195957525 x 86221355 x 391915103 x 209275275 x 78383515 x 41855761 x 283251133 x 190252575 x 83713805 x 5665
Negative:
-1 x -21555325-5 x -4311065-11 x -1959575-25 x -862213-55 x -391915-103 x -209275-275 x -78383-515 x -41855-761 x -28325-1133 x -19025-2575 x -8371-3805 x -5665
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 21,555,325, 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 | 21,555,325 | |
| -1 | -21,555,325 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,555,325.
Example:
1 x 21,555,325 = 21,555,325
and
-1 x -21,555,325 = 21,555,325
Notice both answers equal 21,555,325
With that explanation out of the way, let's continue. Next, we take the number 21,555,325 and divide it by 2:
21,555,325 ÷ 2 = 10,777,662.5
If the quotient is a whole number, then 2 and 10,777,662.5 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 | 21,555,325 | |
| -1 | -21,555,325 |
Now, we try dividing 21,555,325 by 3:
21,555,325 ÷ 3 = 7,185,108.3333
If the quotient is a whole number, then 3 and 7,185,108.3333 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 | 21,555,325 | |
| -1 | -21,555,325 |
Let's try dividing by 4:
21,555,325 ÷ 4 = 5,388,831.25
If the quotient is a whole number, then 4 and 5,388,831.25 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 | 21,555,325 | |
| -1 | 21,555,325 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 25 | 55 | 103 | 275 | 515 | 761 | 1,133 | 2,575 | 3,805 | 5,665 | 8,371 | 19,025 | 28,325 | 41,855 | 78,383 | 209,275 | 391,915 | 862,213 | 1,959,575 | 4,311,065 | 21,555,325 |
| -1 | -5 | -11 | -25 | -55 | -103 | -275 | -515 | -761 | -1,133 | -2,575 | -3,805 | -5,665 | -8,371 | -19,025 | -28,325 | -41,855 | -78,383 | -209,275 | -391,915 | -862,213 | -1,959,575 | -4,311,065 | -21,555,325 |
Here are some more numbers to try:
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