A:
Positive:
1 x 210663537 x 300947911 x 191512377 x 273589137 x 153769959 x 219671507 x 139791997 x 10549
Negative:
-1 x -21066353-7 x -3009479-11 x -1915123-77 x -273589-137 x -153769-959 x -21967-1507 x -13979-1997 x -10549
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 21,066,353, 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 | 21,066,353 | |
| -1 | -21,066,353 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,066,353.
Example:
1 x 21,066,353 = 21,066,353
and
-1 x -21,066,353 = 21,066,353
Notice both answers equal 21,066,353
With that explanation out of the way, let's continue. Next, we take the number 21,066,353 and divide it by 2:
21,066,353 ÷ 2 = 10,533,176.5
If the quotient is a whole number, then 2 and 10,533,176.5 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 | 21,066,353 | |
| -1 | -21,066,353 |
Now, we try dividing 21,066,353 by 3:
21,066,353 ÷ 3 = 7,022,117.6667
If the quotient is a whole number, then 3 and 7,022,117.6667 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 | 21,066,353 | |
| -1 | -21,066,353 |
Let's try dividing by 4:
21,066,353 ÷ 4 = 5,266,588.25
If the quotient is a whole number, then 4 and 5,266,588.25 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 | 21,066,353 | |
| -1 | 21,066,353 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 137 | 959 | 1,507 | 1,997 | 10,549 | 13,979 | 21,967 | 153,769 | 273,589 | 1,915,123 | 3,009,479 | 21,066,353 |
| -1 | -7 | -11 | -77 | -137 | -959 | -1,507 | -1,997 | -10,549 | -13,979 | -21,967 | -153,769 | -273,589 | -1,915,123 | -3,009,479 | -21,066,353 |
Here are some more numbers to try:
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