A:
Positive:
1 x 2161666111 x 196515119 x 1137719209 x 103429293 x 73777353 x 612373223 x 67073883 x 5567
Negative:
-1 x -21616661-11 x -1965151-19 x -1137719-209 x -103429-293 x -73777-353 x -61237-3223 x -6707-3883 x -5567
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 21,616,661, 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 | 21,616,661 | |
| -1 | -21,616,661 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,616,661.
Example:
1 x 21,616,661 = 21,616,661
and
-1 x -21,616,661 = 21,616,661
Notice both answers equal 21,616,661
With that explanation out of the way, let's continue. Next, we take the number 21,616,661 and divide it by 2:
21,616,661 ÷ 2 = 10,808,330.5
If the quotient is a whole number, then 2 and 10,808,330.5 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 | 21,616,661 | |
| -1 | -21,616,661 |
Now, we try dividing 21,616,661 by 3:
21,616,661 ÷ 3 = 7,205,553.6667
If the quotient is a whole number, then 3 and 7,205,553.6667 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 | 21,616,661 | |
| -1 | -21,616,661 |
Let's try dividing by 4:
21,616,661 ÷ 4 = 5,404,165.25
If the quotient is a whole number, then 4 and 5,404,165.25 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 | 21,616,661 | |
| -1 | 21,616,661 |
If you did it right, you will end up with this table:
| 1 | 11 | 19 | 209 | 293 | 353 | 3,223 | 3,883 | 5,567 | 6,707 | 61,237 | 73,777 | 103,429 | 1,137,719 | 1,965,151 | 21,616,661 |
| -1 | -11 | -19 | -209 | -293 | -353 | -3,223 | -3,883 | -5,567 | -6,707 | -61,237 | -73,777 | -103,429 | -1,137,719 | -1,965,151 | -21,616,661 |
Here are some more numbers to try:
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