Q: Is 21,420,800 a Composite Number?

Why is 21,420,800 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 21,420,800 can be evenly divided by 1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 128 160 200 256 320 400 640 800 1,280 1,600 3,200 3,347 6,400 6,694 13,388 16,735 26,776 33,470 53,552 66,940 83,675 107,104 133,880 167,350 214,208 267,760 334,700 428,416 535,520 669,400 856,832 1,071,040 1,338,800 2,142,080 2,677,600 4,284,160 5,355,200 10,710,400 and 21,420,800, with no remainder.

Since 21,420,800 cannot be divided by just 1 and 21,420,800, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).