A:
Positive:
1 x 1601622113 x 123201719 x 84295961 x 262561247 x 64843793 x 201971063 x 150671159 x 13819
Negative:
-1 x -16016221-13 x -1232017-19 x -842959-61 x -262561-247 x -64843-793 x -20197-1063 x -15067-1159 x -13819
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 16,016,221, 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 | 16,016,221 | |
| -1 | -16,016,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 16,016,221.
Example:
1 x 16,016,221 = 16,016,221
and
-1 x -16,016,221 = 16,016,221
Notice both answers equal 16,016,221
With that explanation out of the way, let's continue. Next, we take the number 16,016,221 and divide it by 2:
16,016,221 ÷ 2 = 8,008,110.5
If the quotient is a whole number, then 2 and 8,008,110.5 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 | 16,016,221 | |
| -1 | -16,016,221 |
Now, we try dividing 16,016,221 by 3:
16,016,221 ÷ 3 = 5,338,740.3333
If the quotient is a whole number, then 3 and 5,338,740.3333 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 | 16,016,221 | |
| -1 | -16,016,221 |
Let's try dividing by 4:
16,016,221 ÷ 4 = 4,004,055.25
If the quotient is a whole number, then 4 and 4,004,055.25 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 | 16,016,221 | |
| -1 | 16,016,221 |
If you did it right, you will end up with this table:
| 1 | 13 | 19 | 61 | 247 | 793 | 1,063 | 1,159 | 13,819 | 15,067 | 20,197 | 64,843 | 262,561 | 842,959 | 1,232,017 | 16,016,221 |
| -1 | -13 | -19 | -61 | -247 | -793 | -1,063 | -1,159 | -13,819 | -15,067 | -20,197 | -64,843 | -262,561 | -842,959 | -1,232,017 | -16,016,221 |
Here are some more numbers to try:
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