A:
Positive:
1 x 1215133997 x 1735905717 x 714784743 x 2825893119 x 1021121301 x 403699731 x 1662295117 x 23747
Negative:
-1 x -121513399-7 x -17359057-17 x -7147847-43 x -2825893-119 x -1021121-301 x -403699-731 x -166229-5117 x -23747
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 121,513,399, 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 | 121,513,399 | |
| -1 | -121,513,399 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,513,399.
Example:
1 x 121,513,399 = 121,513,399
and
-1 x -121,513,399 = 121,513,399
Notice both answers equal 121,513,399
With that explanation out of the way, let's continue. Next, we take the number 121,513,399 and divide it by 2:
121,513,399 ÷ 2 = 60,756,699.5
If the quotient is a whole number, then 2 and 60,756,699.5 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 | 121,513,399 | |
| -1 | -121,513,399 |
Now, we try dividing 121,513,399 by 3:
121,513,399 ÷ 3 = 40,504,466.3333
If the quotient is a whole number, then 3 and 40,504,466.3333 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 | 121,513,399 | |
| -1 | -121,513,399 |
Let's try dividing by 4:
121,513,399 ÷ 4 = 30,378,349.75
If the quotient is a whole number, then 4 and 30,378,349.75 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 | 121,513,399 | |
| -1 | 121,513,399 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 43 | 119 | 301 | 731 | 5,117 | 23,747 | 166,229 | 403,699 | 1,021,121 | 2,825,893 | 7,147,847 | 17,359,057 | 121,513,399 |
| -1 | -7 | -17 | -43 | -119 | -301 | -731 | -5,117 | -23,747 | -166,229 | -403,699 | -1,021,121 | -2,825,893 | -7,147,847 | -17,359,057 | -121,513,399 |
Here are some more numbers to try:
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