A:
Positive:
1 x 12150502111 x 1104591123 x 5282827179 x 678799253 x 4802571969 x 617092683 x 452874117 x 29513
Negative:
-1 x -121505021-11 x -11045911-23 x -5282827-179 x -678799-253 x -480257-1969 x -61709-2683 x -45287-4117 x -29513
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 121,505,021, 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 | 121,505,021 | |
| -1 | -121,505,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,505,021.
Example:
1 x 121,505,021 = 121,505,021
and
-1 x -121,505,021 = 121,505,021
Notice both answers equal 121,505,021
With that explanation out of the way, let's continue. Next, we take the number 121,505,021 and divide it by 2:
121,505,021 ÷ 2 = 60,752,510.5
If the quotient is a whole number, then 2 and 60,752,510.5 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 | 121,505,021 | |
| -1 | -121,505,021 |
Now, we try dividing 121,505,021 by 3:
121,505,021 ÷ 3 = 40,501,673.6667
If the quotient is a whole number, then 3 and 40,501,673.6667 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 | 121,505,021 | |
| -1 | -121,505,021 |
Let's try dividing by 4:
121,505,021 ÷ 4 = 30,376,255.25
If the quotient is a whole number, then 4 and 30,376,255.25 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 | 121,505,021 | |
| -1 | 121,505,021 |
If you did it right, you will end up with this table:
| 1 | 11 | 23 | 179 | 253 | 1,969 | 2,683 | 4,117 | 29,513 | 45,287 | 61,709 | 480,257 | 678,799 | 5,282,827 | 11,045,911 | 121,505,021 |
| -1 | -11 | -23 | -179 | -253 | -1,969 | -2,683 | -4,117 | -29,513 | -45,287 | -61,709 | -480,257 | -678,799 | -5,282,827 | -11,045,911 | -121,505,021 |
Here are some more numbers to try:
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