A:
Positive:
1 x 210001337 x 300001911 x 190910377 x 272729223 x 941711223 x 171711561 x 134532453 x 8561
Negative:
-1 x -21000133-7 x -3000019-11 x -1909103-77 x -272729-223 x -94171-1223 x -17171-1561 x -13453-2453 x -8561
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 21,000,133, 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 | 21,000,133 | |
| -1 | -21,000,133 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,000,133.
Example:
1 x 21,000,133 = 21,000,133
and
-1 x -21,000,133 = 21,000,133
Notice both answers equal 21,000,133
With that explanation out of the way, let's continue. Next, we take the number 21,000,133 and divide it by 2:
21,000,133 ÷ 2 = 10,500,066.5
If the quotient is a whole number, then 2 and 10,500,066.5 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 | 21,000,133 | |
| -1 | -21,000,133 |
Now, we try dividing 21,000,133 by 3:
21,000,133 ÷ 3 = 7,000,044.3333
If the quotient is a whole number, then 3 and 7,000,044.3333 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 | 21,000,133 | |
| -1 | -21,000,133 |
Let's try dividing by 4:
21,000,133 ÷ 4 = 5,250,033.25
If the quotient is a whole number, then 4 and 5,250,033.25 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 | 21,000,133 | |
| -1 | 21,000,133 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 223 | 1,223 | 1,561 | 2,453 | 8,561 | 13,453 | 17,171 | 94,171 | 272,729 | 1,909,103 | 3,000,019 | 21,000,133 |
| -1 | -7 | -11 | -77 | -223 | -1,223 | -1,561 | -2,453 | -8,561 | -13,453 | -17,171 | -94,171 | -272,729 | -1,909,103 | -3,000,019 | -21,000,133 |
Here are some more numbers to try:
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