A:
Positive:
1 x 2160960113 x 166227717 x 1271153221 x 97781277 x 78013353 x 612173601 x 60014589 x 4709
Negative:
-1 x -21609601-13 x -1662277-17 x -1271153-221 x -97781-277 x -78013-353 x -61217-3601 x -6001-4589 x -4709
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 21,609,601, 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 | 21,609,601 | |
| -1 | -21,609,601 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,609,601.
Example:
1 x 21,609,601 = 21,609,601
and
-1 x -21,609,601 = 21,609,601
Notice both answers equal 21,609,601
With that explanation out of the way, let's continue. Next, we take the number 21,609,601 and divide it by 2:
21,609,601 ÷ 2 = 10,804,800.5
If the quotient is a whole number, then 2 and 10,804,800.5 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 | 21,609,601 | |
| -1 | -21,609,601 |
Now, we try dividing 21,609,601 by 3:
21,609,601 ÷ 3 = 7,203,200.3333
If the quotient is a whole number, then 3 and 7,203,200.3333 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 | 21,609,601 | |
| -1 | -21,609,601 |
Let's try dividing by 4:
21,609,601 ÷ 4 = 5,402,400.25
If the quotient is a whole number, then 4 and 5,402,400.25 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 | 21,609,601 | |
| -1 | 21,609,601 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 221 | 277 | 353 | 3,601 | 4,589 | 4,709 | 6,001 | 61,217 | 78,013 | 97,781 | 1,271,153 | 1,662,277 | 21,609,601 |
| -1 | -13 | -17 | -221 | -277 | -353 | -3,601 | -4,589 | -4,709 | -6,001 | -61,217 | -78,013 | -97,781 | -1,271,153 | -1,662,277 | -21,609,601 |
Here are some more numbers to try:
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