A:
Positive:
1 x 21064552117 x 1239091367 x 314396379 x 26663991139 x 1849391343 x 1568472341 x 899815293 x 39797
Negative:
-1 x -210645521-17 x -12390913-67 x -3143963-79 x -2666399-1139 x -184939-1343 x -156847-2341 x -89981-5293 x -39797
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 210,645,521, 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 | 210,645,521 | |
| -1 | -210,645,521 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 210,645,521.
Example:
1 x 210,645,521 = 210,645,521
and
-1 x -210,645,521 = 210,645,521
Notice both answers equal 210,645,521
With that explanation out of the way, let's continue. Next, we take the number 210,645,521 and divide it by 2:
210,645,521 ÷ 2 = 105,322,760.5
If the quotient is a whole number, then 2 and 105,322,760.5 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 | 210,645,521 | |
| -1 | -210,645,521 |
Now, we try dividing 210,645,521 by 3:
210,645,521 ÷ 3 = 70,215,173.6667
If the quotient is a whole number, then 3 and 70,215,173.6667 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 | 210,645,521 | |
| -1 | -210,645,521 |
Let's try dividing by 4:
210,645,521 ÷ 4 = 52,661,380.25
If the quotient is a whole number, then 4 and 52,661,380.25 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 | 210,645,521 | |
| -1 | 210,645,521 |
If you did it right, you will end up with this table:
| 1 | 17 | 67 | 79 | 1,139 | 1,343 | 2,341 | 5,293 | 39,797 | 89,981 | 156,847 | 184,939 | 2,666,399 | 3,143,963 | 12,390,913 | 210,645,521 |
| -1 | -17 | -67 | -79 | -1,139 | -1,343 | -2,341 | -5,293 | -39,797 | -89,981 | -156,847 | -184,939 | -2,666,399 | -3,143,963 | -12,390,913 | -210,645,521 |
Here are some more numbers to try:
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