A:
Positive:
1 x 2216538177 x 3166483111 x 2015034777 x 2878621107 x 2071531749 x 2959331177 x 1883218239 x 26903
Negative:
-1 x -221653817-7 x -31664831-11 x -20150347-77 x -2878621-107 x -2071531-749 x -295933-1177 x -188321-8239 x -26903
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 221,653,817, 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 | 221,653,817 | |
| -1 | -221,653,817 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 221,653,817.
Example:
1 x 221,653,817 = 221,653,817
and
-1 x -221,653,817 = 221,653,817
Notice both answers equal 221,653,817
With that explanation out of the way, let's continue. Next, we take the number 221,653,817 and divide it by 2:
221,653,817 ÷ 2 = 110,826,908.5
If the quotient is a whole number, then 2 and 110,826,908.5 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 | 221,653,817 | |
| -1 | -221,653,817 |
Now, we try dividing 221,653,817 by 3:
221,653,817 ÷ 3 = 73,884,605.6667
If the quotient is a whole number, then 3 and 73,884,605.6667 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 | 221,653,817 | |
| -1 | -221,653,817 |
Let's try dividing by 4:
221,653,817 ÷ 4 = 55,413,454.25
If the quotient is a whole number, then 4 and 55,413,454.25 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 | 221,653,817 | |
| -1 | 221,653,817 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 107 | 749 | 1,177 | 8,239 | 26,903 | 188,321 | 295,933 | 2,071,531 | 2,878,621 | 20,150,347 | 31,664,831 | 221,653,817 |
| -1 | -7 | -11 | -77 | -107 | -749 | -1,177 | -8,239 | -26,903 | -188,321 | -295,933 | -2,071,531 | -2,878,621 | -20,150,347 | -31,664,831 | -221,653,817 |
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