A:
Positive:
1 x 210131117 x 300187343 x 48867749 x 428839301 x 698112107 x 9973
Negative:
-1 x -21013111-7 x -3001873-43 x -488677-49 x -428839-301 x -69811-2107 x -9973
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 21,013,111, 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 | 21,013,111 | |
| -1 | -21,013,111 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,013,111.
Example:
1 x 21,013,111 = 21,013,111
and
-1 x -21,013,111 = 21,013,111
Notice both answers equal 21,013,111
With that explanation out of the way, let's continue. Next, we take the number 21,013,111 and divide it by 2:
21,013,111 ÷ 2 = 10,506,555.5
If the quotient is a whole number, then 2 and 10,506,555.5 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 | 21,013,111 | |
| -1 | -21,013,111 |
Now, we try dividing 21,013,111 by 3:
21,013,111 ÷ 3 = 7,004,370.3333
If the quotient is a whole number, then 3 and 7,004,370.3333 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 | 21,013,111 | |
| -1 | -21,013,111 |
Let's try dividing by 4:
21,013,111 ÷ 4 = 5,253,277.75
If the quotient is a whole number, then 4 and 5,253,277.75 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 | 21,013,111 | |
| -1 | 21,013,111 |
If you did it right, you will end up with this table:
| 1 | 7 | 43 | 49 | 301 | 2,107 | 9,973 | 69,811 | 428,839 | 488,677 | 3,001,873 | 21,013,111 |
| -1 | -7 | -43 | -49 | -301 | -2,107 | -9,973 | -69,811 | -428,839 | -488,677 | -3,001,873 | -21,013,111 |
Here are some more numbers to try:
Try the factor calculator