A:
Positive:
1 x 12120342117 x 712961341 x 295618153 x 2286857193 x 627997289 x 419389697 x 173893901 x 1345212173 x 557773281 x 369417913 x 1531710229 x 11849
Negative:
-1 x -121203421-17 x -7129613-41 x -2956181-53 x -2286857-193 x -627997-289 x -419389-697 x -173893-901 x -134521-2173 x -55777-3281 x -36941-7913 x -15317-10229 x -11849
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 121,203,421, 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 | 121,203,421 | |
| -1 | -121,203,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 121,203,421.
Example:
1 x 121,203,421 = 121,203,421
and
-1 x -121,203,421 = 121,203,421
Notice both answers equal 121,203,421
With that explanation out of the way, let's continue. Next, we take the number 121,203,421 and divide it by 2:
121,203,421 ÷ 2 = 60,601,710.5
If the quotient is a whole number, then 2 and 60,601,710.5 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 | 121,203,421 | |
| -1 | -121,203,421 |
Now, we try dividing 121,203,421 by 3:
121,203,421 ÷ 3 = 40,401,140.3333
If the quotient is a whole number, then 3 and 40,401,140.3333 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 | 121,203,421 | |
| -1 | -121,203,421 |
Let's try dividing by 4:
121,203,421 ÷ 4 = 30,300,855.25
If the quotient is a whole number, then 4 and 30,300,855.25 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 | 121,203,421 | |
| -1 | 121,203,421 |
If you did it right, you will end up with this table:
| 1 | 17 | 41 | 53 | 193 | 289 | 697 | 901 | 2,173 | 3,281 | 7,913 | 10,229 | 11,849 | 15,317 | 36,941 | 55,777 | 134,521 | 173,893 | 419,389 | 627,997 | 2,286,857 | 2,956,181 | 7,129,613 | 121,203,421 |
| -1 | -17 | -41 | -53 | -193 | -289 | -697 | -901 | -2,173 | -3,281 | -7,913 | -10,229 | -11,849 | -15,317 | -36,941 | -55,777 | -134,521 | -173,893 | -419,389 | -627,997 | -2,286,857 | -2,956,181 | -7,129,613 | -121,203,421 |
Here are some more numbers to try:
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