A:
Positive:
1 x 216079017 x 308684317 x 1271053107 x 201943119 x 181579749 x 288491697 x 127331819 x 11879
Negative:
-1 x -21607901-7 x -3086843-17 x -1271053-107 x -201943-119 x -181579-749 x -28849-1697 x -12733-1819 x -11879
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 21,607,901, 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 | 21,607,901 | |
| -1 | -21,607,901 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,607,901.
Example:
1 x 21,607,901 = 21,607,901
and
-1 x -21,607,901 = 21,607,901
Notice both answers equal 21,607,901
With that explanation out of the way, let's continue. Next, we take the number 21,607,901 and divide it by 2:
21,607,901 ÷ 2 = 10,803,950.5
If the quotient is a whole number, then 2 and 10,803,950.5 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 | 21,607,901 | |
| -1 | -21,607,901 |
Now, we try dividing 21,607,901 by 3:
21,607,901 ÷ 3 = 7,202,633.6667
If the quotient is a whole number, then 3 and 7,202,633.6667 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 | 21,607,901 | |
| -1 | -21,607,901 |
Let's try dividing by 4:
21,607,901 ÷ 4 = 5,401,975.25
If the quotient is a whole number, then 4 and 5,401,975.25 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 | 21,607,901 | |
| -1 | 21,607,901 |
If you did it right, you will end up with this table:
| 1 | 7 | 17 | 107 | 119 | 749 | 1,697 | 1,819 | 11,879 | 12,733 | 28,849 | 181,579 | 201,943 | 1,271,053 | 3,086,843 | 21,607,901 |
| -1 | -7 | -17 | -107 | -119 | -749 | -1,697 | -1,819 | -11,879 | -12,733 | -28,849 | -181,579 | -201,943 | -1,271,053 | -3,086,843 | -21,607,901 |
Here are some more numbers to try:
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