A:
Positive:
1 x 2721502129 x 93844941 x 66378147 x 579043487 x 558831189 x 228891363 x 199671927 x 14123
Negative:
-1 x -27215021-29 x -938449-41 x -663781-47 x -579043-487 x -55883-1189 x -22889-1363 x -19967-1927 x -14123
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 27,215,021, 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 | 27,215,021 | |
| -1 | -27,215,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 27,215,021.
Example:
1 x 27,215,021 = 27,215,021
and
-1 x -27,215,021 = 27,215,021
Notice both answers equal 27,215,021
With that explanation out of the way, let's continue. Next, we take the number 27,215,021 and divide it by 2:
27,215,021 ÷ 2 = 13,607,510.5
If the quotient is a whole number, then 2 and 13,607,510.5 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 | 27,215,021 | |
| -1 | -27,215,021 |
Now, we try dividing 27,215,021 by 3:
27,215,021 ÷ 3 = 9,071,673.6667
If the quotient is a whole number, then 3 and 9,071,673.6667 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 | 27,215,021 | |
| -1 | -27,215,021 |
Let's try dividing by 4:
27,215,021 ÷ 4 = 6,803,755.25
If the quotient is a whole number, then 4 and 6,803,755.25 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 | 27,215,021 | |
| -1 | 27,215,021 |
If you did it right, you will end up with this table:
| 1 | 29 | 41 | 47 | 487 | 1,189 | 1,363 | 1,927 | 14,123 | 19,967 | 22,889 | 55,883 | 579,043 | 663,781 | 938,449 | 27,215,021 |
| -1 | -29 | -41 | -47 | -487 | -1,189 | -1,363 | -1,927 | -14,123 | -19,967 | -22,889 | -55,883 | -579,043 | -663,781 | -938,449 | -27,215,021 |
Here are some more numbers to try:
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