A:
Positive:
1 x 216041217 x 308630311 x 196401119 x 113705977 x 280573133 x 162437209 x 1033691463 x 14767
Negative:
-1 x -21604121-7 x -3086303-11 x -1964011-19 x -1137059-77 x -280573-133 x -162437-209 x -103369-1463 x -14767
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 21,604,121, 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 | 21,604,121 | |
| -1 | -21,604,121 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,604,121.
Example:
1 x 21,604,121 = 21,604,121
and
-1 x -21,604,121 = 21,604,121
Notice both answers equal 21,604,121
With that explanation out of the way, let's continue. Next, we take the number 21,604,121 and divide it by 2:
21,604,121 ÷ 2 = 10,802,060.5
If the quotient is a whole number, then 2 and 10,802,060.5 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 | 21,604,121 | |
| -1 | -21,604,121 |
Now, we try dividing 21,604,121 by 3:
21,604,121 ÷ 3 = 7,201,373.6667
If the quotient is a whole number, then 3 and 7,201,373.6667 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 | 21,604,121 | |
| -1 | -21,604,121 |
Let's try dividing by 4:
21,604,121 ÷ 4 = 5,401,030.25
If the quotient is a whole number, then 4 and 5,401,030.25 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 | 21,604,121 | |
| -1 | 21,604,121 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 19 | 77 | 133 | 209 | 1,463 | 14,767 | 103,369 | 162,437 | 280,573 | 1,137,059 | 1,964,011 | 3,086,303 | 21,604,121 |
| -1 | -7 | -11 | -19 | -77 | -133 | -209 | -1,463 | -14,767 | -103,369 | -162,437 | -280,573 | -1,137,059 | -1,964,011 | -3,086,303 | -21,604,121 |
Here are some more numbers to try:
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