A:
Positive:
1 x 21105522113 x 1623501717 x 12415013199 x 1060579221 x 9550012587 x 815833383 x 623874799 x 43979
Negative:
-1 x -211055221-13 x -16235017-17 x -12415013-199 x -1060579-221 x -955001-2587 x -81583-3383 x -62387-4799 x -43979
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 211,055,221, 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 | 211,055,221 | |
| -1 | -211,055,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 211,055,221.
Example:
1 x 211,055,221 = 211,055,221
and
-1 x -211,055,221 = 211,055,221
Notice both answers equal 211,055,221
With that explanation out of the way, let's continue. Next, we take the number 211,055,221 and divide it by 2:
211,055,221 ÷ 2 = 105,527,610.5
If the quotient is a whole number, then 2 and 105,527,610.5 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 | 211,055,221 | |
| -1 | -211,055,221 |
Now, we try dividing 211,055,221 by 3:
211,055,221 ÷ 3 = 70,351,740.3333
If the quotient is a whole number, then 3 and 70,351,740.3333 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 | 211,055,221 | |
| -1 | -211,055,221 |
Let's try dividing by 4:
211,055,221 ÷ 4 = 52,763,805.25
If the quotient is a whole number, then 4 and 52,763,805.25 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 | 211,055,221 | |
| -1 | 211,055,221 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 199 | 221 | 2,587 | 3,383 | 4,799 | 43,979 | 62,387 | 81,583 | 955,001 | 1,060,579 | 12,415,013 | 16,235,017 | 211,055,221 |
| -1 | -13 | -17 | -199 | -221 | -2,587 | -3,383 | -4,799 | -43,979 | -62,387 | -81,583 | -955,001 | -1,060,579 | -12,415,013 | -16,235,017 | -211,055,221 |
Here are some more numbers to try:
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