A:
Positive:
1 x 215643617 x 308062313 x 165879749 x 44008991 x 23697197 x 222313349 x 61789637 x 33853679 x 317591261 x 171012443 x 88274537 x 4753
Negative:
-1 x -21564361-7 x -3080623-13 x -1658797-49 x -440089-91 x -236971-97 x -222313-349 x -61789-637 x -33853-679 x -31759-1261 x -17101-2443 x -8827-4537 x -4753
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 21,564,361, 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 | 21,564,361 | |
| -1 | -21,564,361 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,564,361.
Example:
1 x 21,564,361 = 21,564,361
and
-1 x -21,564,361 = 21,564,361
Notice both answers equal 21,564,361
With that explanation out of the way, let's continue. Next, we take the number 21,564,361 and divide it by 2:
21,564,361 ÷ 2 = 10,782,180.5
If the quotient is a whole number, then 2 and 10,782,180.5 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 | 21,564,361 | |
| -1 | -21,564,361 |
Now, we try dividing 21,564,361 by 3:
21,564,361 ÷ 3 = 7,188,120.3333
If the quotient is a whole number, then 3 and 7,188,120.3333 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 | 21,564,361 | |
| -1 | -21,564,361 |
Let's try dividing by 4:
21,564,361 ÷ 4 = 5,391,090.25
If the quotient is a whole number, then 4 and 5,391,090.25 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 | 21,564,361 | |
| -1 | 21,564,361 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 49 | 91 | 97 | 349 | 637 | 679 | 1,261 | 2,443 | 4,537 | 4,753 | 8,827 | 17,101 | 31,759 | 33,853 | 61,789 | 222,313 | 236,971 | 440,089 | 1,658,797 | 3,080,623 | 21,564,361 |
| -1 | -7 | -13 | -49 | -91 | -97 | -349 | -637 | -679 | -1,261 | -2,443 | -4,537 | -4,753 | -8,827 | -17,101 | -31,759 | -33,853 | -61,789 | -222,313 | -236,971 | -440,089 | -1,658,797 | -3,080,623 | -21,564,361 |
Here are some more numbers to try:
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