A:
Positive:
1 x 1203212155 x 240642437 x 1718874535 x 343774949 x 245553571 x 1694665245 x 491107355 x 338933497 x 2420952485 x 484193479 x 345856917 x 17395
Negative:
-1 x -120321215-5 x -24064243-7 x -17188745-35 x -3437749-49 x -2455535-71 x -1694665-245 x -491107-355 x -338933-497 x -242095-2485 x -48419-3479 x -34585-6917 x -17395
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 120,321,215, 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 | 120,321,215 | |
| -1 | -120,321,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 120,321,215.
Example:
1 x 120,321,215 = 120,321,215
and
-1 x -120,321,215 = 120,321,215
Notice both answers equal 120,321,215
With that explanation out of the way, let's continue. Next, we take the number 120,321,215 and divide it by 2:
120,321,215 ÷ 2 = 60,160,607.5
If the quotient is a whole number, then 2 and 60,160,607.5 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 | 120,321,215 | |
| -1 | -120,321,215 |
Now, we try dividing 120,321,215 by 3:
120,321,215 ÷ 3 = 40,107,071.6667
If the quotient is a whole number, then 3 and 40,107,071.6667 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 | 120,321,215 | |
| -1 | -120,321,215 |
Let's try dividing by 4:
120,321,215 ÷ 4 = 30,080,303.75
If the quotient is a whole number, then 4 and 30,080,303.75 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 | 120,321,215 | |
| -1 | 120,321,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 71 | 245 | 355 | 497 | 2,485 | 3,479 | 6,917 | 17,395 | 34,585 | 48,419 | 242,095 | 338,933 | 491,107 | 1,694,665 | 2,455,535 | 3,437,749 | 17,188,745 | 24,064,243 | 120,321,215 |
| -1 | -5 | -7 | -35 | -49 | -71 | -245 | -355 | -497 | -2,485 | -3,479 | -6,917 | -17,395 | -34,585 | -48,419 | -242,095 | -338,933 | -491,107 | -1,694,665 | -2,455,535 | -3,437,749 | -17,188,745 | -24,064,243 | -120,321,215 |
Here are some more numbers to try:
Try the factor calculator