A:
Positive:
1 x 21024262117 x 1236721337 x 568223379 x 2661299629 x 3342491343 x 1565472923 x 719274231 x 49691
Negative:
-1 x -210242621-17 x -12367213-37 x -5682233-79 x -2661299-629 x -334249-1343 x -156547-2923 x -71927-4231 x -49691
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 210,242,621, 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 | 210,242,621 | |
| -1 | -210,242,621 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,242,621.
Example:
1 x 210,242,621 = 210,242,621
and
-1 x -210,242,621 = 210,242,621
Notice both answers equal 210,242,621
With that explanation out of the way, let's continue. Next, we take the number 210,242,621 and divide it by 2:
210,242,621 ÷ 2 = 105,121,310.5
If the quotient is a whole number, then 2 and 105,121,310.5 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 | 210,242,621 | |
| -1 | -210,242,621 |
Now, we try dividing 210,242,621 by 3:
210,242,621 ÷ 3 = 70,080,873.6667
If the quotient is a whole number, then 3 and 70,080,873.6667 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 | 210,242,621 | |
| -1 | -210,242,621 |
Let's try dividing by 4:
210,242,621 ÷ 4 = 52,560,655.25
If the quotient is a whole number, then 4 and 52,560,655.25 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 | 210,242,621 | |
| -1 | 210,242,621 |
If you did it right, you will end up with this table:
| 1 | 17 | 37 | 79 | 629 | 1,343 | 2,923 | 4,231 | 49,691 | 71,927 | 156,547 | 334,249 | 2,661,299 | 5,682,233 | 12,367,213 | 210,242,621 |
| -1 | -17 | -37 | -79 | -629 | -1,343 | -2,923 | -4,231 | -49,691 | -71,927 | -156,547 | -334,249 | -2,661,299 | -5,682,233 | -12,367,213 | -210,242,621 |
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