A:
Positive:
1 x 1216151097 x 1737358711 x 1105591949 x 248194177 x 1579417343 x 354563539 x 2256313773 x 32233
Negative:
-1 x -121615109-7 x -17373587-11 x -11055919-49 x -2481941-77 x -1579417-343 x -354563-539 x -225631-3773 x -32233
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 121,615,109, 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 | 121,615,109 | |
| -1 | -121,615,109 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,615,109.
Example:
1 x 121,615,109 = 121,615,109
and
-1 x -121,615,109 = 121,615,109
Notice both answers equal 121,615,109
With that explanation out of the way, let's continue. Next, we take the number 121,615,109 and divide it by 2:
121,615,109 ÷ 2 = 60,807,554.5
If the quotient is a whole number, then 2 and 60,807,554.5 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 | 121,615,109 | |
| -1 | -121,615,109 |
Now, we try dividing 121,615,109 by 3:
121,615,109 ÷ 3 = 40,538,369.6667
If the quotient is a whole number, then 3 and 40,538,369.6667 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 | 121,615,109 | |
| -1 | -121,615,109 |
Let's try dividing by 4:
121,615,109 ÷ 4 = 30,403,777.25
If the quotient is a whole number, then 4 and 30,403,777.25 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 | 121,615,109 | |
| -1 | 121,615,109 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 49 | 77 | 343 | 539 | 3,773 | 32,233 | 225,631 | 354,563 | 1,579,417 | 2,481,941 | 11,055,919 | 17,373,587 | 121,615,109 |
| -1 | -7 | -11 | -49 | -77 | -343 | -539 | -3,773 | -32,233 | -225,631 | -354,563 | -1,579,417 | -2,481,941 | -11,055,919 | -17,373,587 | -121,615,109 |
Here are some more numbers to try:
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