A:
Positive:
1 x 2215116655 x 4430233359 x 3754435295 x 750887313 x 7077051565 x 1415412399 x 9233511995 x 18467
Negative:
-1 x -221511665-5 x -44302333-59 x -3754435-295 x -750887-313 x -707705-1565 x -141541-2399 x -92335-11995 x -18467
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 221,511,665, 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 | 221,511,665 | |
| -1 | -221,511,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 221,511,665.
Example:
1 x 221,511,665 = 221,511,665
and
-1 x -221,511,665 = 221,511,665
Notice both answers equal 221,511,665
With that explanation out of the way, let's continue. Next, we take the number 221,511,665 and divide it by 2:
221,511,665 ÷ 2 = 110,755,832.5
If the quotient is a whole number, then 2 and 110,755,832.5 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 | 221,511,665 | |
| -1 | -221,511,665 |
Now, we try dividing 221,511,665 by 3:
221,511,665 ÷ 3 = 73,837,221.6667
If the quotient is a whole number, then 3 and 73,837,221.6667 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 | 221,511,665 | |
| -1 | -221,511,665 |
Let's try dividing by 4:
221,511,665 ÷ 4 = 55,377,916.25
If the quotient is a whole number, then 4 and 55,377,916.25 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 | 221,511,665 | |
| -1 | 221,511,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 59 | 295 | 313 | 1,565 | 2,399 | 11,995 | 18,467 | 92,335 | 141,541 | 707,705 | 750,887 | 3,754,435 | 44,302,333 | 221,511,665 |
| -1 | -5 | -59 | -295 | -313 | -1,565 | -2,399 | -11,995 | -18,467 | -92,335 | -141,541 | -707,705 | -750,887 | -3,754,435 | -44,302,333 | -221,511,665 |
Here are some more numbers to try:
Try the factor calculator