A:
Positive:
1 x 210670677 x 300958119 x 1108793133 x 158399151 x 1395171049 x 200831057 x 199312869 x 7343
Negative:
-1 x -21067067-7 x -3009581-19 x -1108793-133 x -158399-151 x -139517-1049 x -20083-1057 x -19931-2869 x -7343
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 21,067,067, 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 | 21,067,067 | |
| -1 | -21,067,067 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,067,067.
Example:
1 x 21,067,067 = 21,067,067
and
-1 x -21,067,067 = 21,067,067
Notice both answers equal 21,067,067
With that explanation out of the way, let's continue. Next, we take the number 21,067,067 and divide it by 2:
21,067,067 ÷ 2 = 10,533,533.5
If the quotient is a whole number, then 2 and 10,533,533.5 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 | 21,067,067 | |
| -1 | -21,067,067 |
Now, we try dividing 21,067,067 by 3:
21,067,067 ÷ 3 = 7,022,355.6667
If the quotient is a whole number, then 3 and 7,022,355.6667 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 | 21,067,067 | |
| -1 | -21,067,067 |
Let's try dividing by 4:
21,067,067 ÷ 4 = 5,266,766.75
If the quotient is a whole number, then 4 and 5,266,766.75 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 | 21,067,067 | |
| -1 | 21,067,067 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 133 | 151 | 1,049 | 1,057 | 2,869 | 7,343 | 19,931 | 20,083 | 139,517 | 158,399 | 1,108,793 | 3,009,581 | 21,067,067 |
| -1 | -7 | -19 | -133 | -151 | -1,049 | -1,057 | -2,869 | -7,343 | -19,931 | -20,083 | -139,517 | -158,399 | -1,108,793 | -3,009,581 | -21,067,067 |
Here are some more numbers to try:
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