A:
Positive:
1 x 21142155111 x 19220141137 x 1543223239 x 884609587 x 3601731507 x 1402932629 x 804196457 x 32743
Negative:
-1 x -211421551-11 x -19220141-137 x -1543223-239 x -884609-587 x -360173-1507 x -140293-2629 x -80419-6457 x -32743
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 211,421,551, 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 | 211,421,551 | |
| -1 | -211,421,551 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 211,421,551.
Example:
1 x 211,421,551 = 211,421,551
and
-1 x -211,421,551 = 211,421,551
Notice both answers equal 211,421,551
With that explanation out of the way, let's continue. Next, we take the number 211,421,551 and divide it by 2:
211,421,551 ÷ 2 = 105,710,775.5
If the quotient is a whole number, then 2 and 105,710,775.5 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 | 211,421,551 | |
| -1 | -211,421,551 |
Now, we try dividing 211,421,551 by 3:
211,421,551 ÷ 3 = 70,473,850.3333
If the quotient is a whole number, then 3 and 70,473,850.3333 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 | 211,421,551 | |
| -1 | -211,421,551 |
Let's try dividing by 4:
211,421,551 ÷ 4 = 52,855,387.75
If the quotient is a whole number, then 4 and 52,855,387.75 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 | 211,421,551 | |
| -1 | 211,421,551 |
If you did it right, you will end up with this table:
| 1 | 11 | 137 | 239 | 587 | 1,507 | 2,629 | 6,457 | 32,743 | 80,419 | 140,293 | 360,173 | 884,609 | 1,543,223 | 19,220,141 | 211,421,551 |
| -1 | -11 | -137 | -239 | -587 | -1,507 | -2,629 | -6,457 | -32,743 | -80,419 | -140,293 | -360,173 | -884,609 | -1,543,223 | -19,220,141 | -211,421,551 |
Here are some more numbers to try:
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