A:
Positive:
1 x 2119129917 x 124654771 x 29846997 x 218467181 x 1170791207 x 175571649 x 128513077 x 6887
Negative:
-1 x -21191299-17 x -1246547-71 x -298469-97 x -218467-181 x -117079-1207 x -17557-1649 x -12851-3077 x -6887
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 21,191,299, 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 | 21,191,299 | |
| -1 | -21,191,299 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,191,299.
Example:
1 x 21,191,299 = 21,191,299
and
-1 x -21,191,299 = 21,191,299
Notice both answers equal 21,191,299
With that explanation out of the way, let's continue. Next, we take the number 21,191,299 and divide it by 2:
21,191,299 ÷ 2 = 10,595,649.5
If the quotient is a whole number, then 2 and 10,595,649.5 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 | 21,191,299 | |
| -1 | -21,191,299 |
Now, we try dividing 21,191,299 by 3:
21,191,299 ÷ 3 = 7,063,766.3333
If the quotient is a whole number, then 3 and 7,063,766.3333 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 | 21,191,299 | |
| -1 | -21,191,299 |
Let's try dividing by 4:
21,191,299 ÷ 4 = 5,297,824.75
If the quotient is a whole number, then 4 and 5,297,824.75 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 | 21,191,299 | |
| -1 | 21,191,299 |
If you did it right, you will end up with this table:
| 1 | 17 | 71 | 97 | 181 | 1,207 | 1,649 | 3,077 | 6,887 | 12,851 | 17,557 | 117,079 | 218,467 | 298,469 | 1,246,547 | 21,191,299 |
| -1 | -17 | -71 | -97 | -181 | -1,207 | -1,649 | -3,077 | -6,887 | -12,851 | -17,557 | -117,079 | -218,467 | -298,469 | -1,246,547 | -21,191,299 |
Here are some more numbers to try:
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