A:
Positive:
1 x 211391955 x 42278397 x 301988511 x 192174535 x 60397755 x 38434977 x 274535385 x 54907
Negative:
-1 x -21139195-5 x -4227839-7 x -3019885-11 x -1921745-35 x -603977-55 x -384349-77 x -274535-385 x -54907
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 21,139,195, 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 | 21,139,195 | |
| -1 | -21,139,195 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,139,195.
Example:
1 x 21,139,195 = 21,139,195
and
-1 x -21,139,195 = 21,139,195
Notice both answers equal 21,139,195
With that explanation out of the way, let's continue. Next, we take the number 21,139,195 and divide it by 2:
21,139,195 ÷ 2 = 10,569,597.5
If the quotient is a whole number, then 2 and 10,569,597.5 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 | 21,139,195 | |
| -1 | -21,139,195 |
Now, we try dividing 21,139,195 by 3:
21,139,195 ÷ 3 = 7,046,398.3333
If the quotient is a whole number, then 3 and 7,046,398.3333 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 | 21,139,195 | |
| -1 | -21,139,195 |
Let's try dividing by 4:
21,139,195 ÷ 4 = 5,284,798.75
If the quotient is a whole number, then 4 and 5,284,798.75 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 | 21,139,195 | |
| -1 | 21,139,195 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 385 | 54,907 | 274,535 | 384,349 | 603,977 | 1,921,745 | 3,019,885 | 4,227,839 | 21,139,195 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -385 | -54,907 | -274,535 | -384,349 | -603,977 | -1,921,745 | -3,019,885 | -4,227,839 | -21,139,195 |
Here are some more numbers to try:
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