A:
Positive:
1 x 12121120713 x 932393917 x 7130071221 x 548467331 x 3661971657 x 731514303 x 281695627 x 21541
Negative:
-1 x -121211207-13 x -9323939-17 x -7130071-221 x -548467-331 x -366197-1657 x -73151-4303 x -28169-5627 x -21541
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 121,211,207, 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 | 121,211,207 | |
| -1 | -121,211,207 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,211,207.
Example:
1 x 121,211,207 = 121,211,207
and
-1 x -121,211,207 = 121,211,207
Notice both answers equal 121,211,207
With that explanation out of the way, let's continue. Next, we take the number 121,211,207 and divide it by 2:
121,211,207 ÷ 2 = 60,605,603.5
If the quotient is a whole number, then 2 and 60,605,603.5 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 | 121,211,207 | |
| -1 | -121,211,207 |
Now, we try dividing 121,211,207 by 3:
121,211,207 ÷ 3 = 40,403,735.6667
If the quotient is a whole number, then 3 and 40,403,735.6667 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 | 121,211,207 | |
| -1 | -121,211,207 |
Let's try dividing by 4:
121,211,207 ÷ 4 = 30,302,801.75
If the quotient is a whole number, then 4 and 30,302,801.75 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 | 121,211,207 | |
| -1 | 121,211,207 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 221 | 331 | 1,657 | 4,303 | 5,627 | 21,541 | 28,169 | 73,151 | 366,197 | 548,467 | 7,130,071 | 9,323,939 | 121,211,207 |
| -1 | -13 | -17 | -221 | -331 | -1,657 | -4,303 | -5,627 | -21,541 | -28,169 | -73,151 | -366,197 | -548,467 | -7,130,071 | -9,323,939 | -121,211,207 |
Here are some more numbers to try:
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