A:
Positive:
1 x 2135404711 x 194127713 x 164261959 x 361933143 x 149329649 x 32903767 x 278412531 x 8437
Negative:
-1 x -21354047-11 x -1941277-13 x -1642619-59 x -361933-143 x -149329-649 x -32903-767 x -27841-2531 x -8437
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 21,354,047, 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 | 21,354,047 | |
| -1 | -21,354,047 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,354,047.
Example:
1 x 21,354,047 = 21,354,047
and
-1 x -21,354,047 = 21,354,047
Notice both answers equal 21,354,047
With that explanation out of the way, let's continue. Next, we take the number 21,354,047 and divide it by 2:
21,354,047 ÷ 2 = 10,677,023.5
If the quotient is a whole number, then 2 and 10,677,023.5 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 | 21,354,047 | |
| -1 | -21,354,047 |
Now, we try dividing 21,354,047 by 3:
21,354,047 ÷ 3 = 7,118,015.6667
If the quotient is a whole number, then 3 and 7,118,015.6667 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 | 21,354,047 | |
| -1 | -21,354,047 |
Let's try dividing by 4:
21,354,047 ÷ 4 = 5,338,511.75
If the quotient is a whole number, then 4 and 5,338,511.75 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 | 21,354,047 | |
| -1 | 21,354,047 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 59 | 143 | 649 | 767 | 2,531 | 8,437 | 27,841 | 32,903 | 149,329 | 361,933 | 1,642,619 | 1,941,277 | 21,354,047 |
| -1 | -11 | -13 | -59 | -143 | -649 | -767 | -2,531 | -8,437 | -27,841 | -32,903 | -149,329 | -361,933 | -1,642,619 | -1,941,277 | -21,354,047 |
Here are some more numbers to try:
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