A:
Positive:
1 x 212103017 x 303004323 x 92218747 x 451283161 x 131741329 x 644691081 x 196212803 x 7567
Negative:
-1 x -21210301-7 x -3030043-23 x -922187-47 x -451283-161 x -131741-329 x -64469-1081 x -19621-2803 x -7567
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 21,210,301, 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 | 21,210,301 | |
| -1 | -21,210,301 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,210,301.
Example:
1 x 21,210,301 = 21,210,301
and
-1 x -21,210,301 = 21,210,301
Notice both answers equal 21,210,301
With that explanation out of the way, let's continue. Next, we take the number 21,210,301 and divide it by 2:
21,210,301 ÷ 2 = 10,605,150.5
If the quotient is a whole number, then 2 and 10,605,150.5 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 | 21,210,301 | |
| -1 | -21,210,301 |
Now, we try dividing 21,210,301 by 3:
21,210,301 ÷ 3 = 7,070,100.3333
If the quotient is a whole number, then 3 and 7,070,100.3333 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 | 21,210,301 | |
| -1 | -21,210,301 |
Let's try dividing by 4:
21,210,301 ÷ 4 = 5,302,575.25
If the quotient is a whole number, then 4 and 5,302,575.25 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 | 21,210,301 | |
| -1 | 21,210,301 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 47 | 161 | 329 | 1,081 | 2,803 | 7,567 | 19,621 | 64,469 | 131,741 | 451,283 | 922,187 | 3,030,043 | 21,210,301 |
| -1 | -7 | -23 | -47 | -161 | -329 | -1,081 | -2,803 | -7,567 | -19,621 | -64,469 | -131,741 | -451,283 | -922,187 | -3,030,043 | -21,210,301 |
Here are some more numbers to try:
Try the factor calculator