A:
Positive:
1 x 1215107817 x 1735868317 x 7147693119 x 1021099601 x 2021811699 x 715194207 x 2888310217 x 11893
Negative:
-1 x -121510781-7 x -17358683-17 x -7147693-119 x -1021099-601 x -202181-1699 x -71519-4207 x -28883-10217 x -11893
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 121,510,781, 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 | 121,510,781 | |
| -1 | -121,510,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,510,781.
Example:
1 x 121,510,781 = 121,510,781
and
-1 x -121,510,781 = 121,510,781
Notice both answers equal 121,510,781
With that explanation out of the way, let's continue. Next, we take the number 121,510,781 and divide it by 2:
121,510,781 ÷ 2 = 60,755,390.5
If the quotient is a whole number, then 2 and 60,755,390.5 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 | 121,510,781 | |
| -1 | -121,510,781 |
Now, we try dividing 121,510,781 by 3:
121,510,781 ÷ 3 = 40,503,593.6667
If the quotient is a whole number, then 3 and 40,503,593.6667 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 | 121,510,781 | |
| -1 | -121,510,781 |
Let's try dividing by 4:
121,510,781 ÷ 4 = 30,377,695.25
If the quotient is a whole number, then 4 and 30,377,695.25 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 | 121,510,781 | |
| -1 | 121,510,781 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 119 | 601 | 1,699 | 4,207 | 10,217 | 11,893 | 28,883 | 71,519 | 202,181 | 1,021,099 | 7,147,693 | 17,358,683 | 121,510,781 |
| -1 | -7 | -17 | -119 | -601 | -1,699 | -4,207 | -10,217 | -11,893 | -28,883 | -71,519 | -202,181 | -1,021,099 | -7,147,693 | -17,358,683 | -121,510,781 |
Here are some more numbers to try:
Try the factor calculator