A:
Positive:
1 x 21660622113 x 1666201747 x 4608643241 x 898781611 x 3545111471 x 1472513133 x 6913711327 x 19123
Negative:
-1 x -216606221-13 x -16662017-47 x -4608643-241 x -898781-611 x -354511-1471 x -147251-3133 x -69137-11327 x -19123
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 216,606,221, 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 | 216,606,221 | |
| -1 | -216,606,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 216,606,221.
Example:
1 x 216,606,221 = 216,606,221
and
-1 x -216,606,221 = 216,606,221
Notice both answers equal 216,606,221
With that explanation out of the way, let's continue. Next, we take the number 216,606,221 and divide it by 2:
216,606,221 ÷ 2 = 108,303,110.5
If the quotient is a whole number, then 2 and 108,303,110.5 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 | 216,606,221 | |
| -1 | -216,606,221 |
Now, we try dividing 216,606,221 by 3:
216,606,221 ÷ 3 = 72,202,073.6667
If the quotient is a whole number, then 3 and 72,202,073.6667 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 | 216,606,221 | |
| -1 | -216,606,221 |
Let's try dividing by 4:
216,606,221 ÷ 4 = 54,151,555.25
If the quotient is a whole number, then 4 and 54,151,555.25 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 | 216,606,221 | |
| -1 | 216,606,221 |
If you did it right, you will end up with this table:
| 1 | 13 | 47 | 241 | 611 | 1,471 | 3,133 | 11,327 | 19,123 | 69,137 | 147,251 | 354,511 | 898,781 | 4,608,643 | 16,662,017 | 216,606,221 |
| -1 | -13 | -47 | -241 | -611 | -1,471 | -3,133 | -11,327 | -19,123 | -69,137 | -147,251 | -354,511 | -898,781 | -4,608,643 | -16,662,017 | -216,606,221 |
Here are some more numbers to try:
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