Q: Is 21,129,200 a Composite Number?

Why is 21,129,200 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 21,129,200 can be evenly divided by 1 2 4 5 8 10 16 20 25 40 50 80 100 101 200 202 400 404 505 523 808 1,010 1,046 1,616 2,020 2,092 2,525 2,615 4,040 4,184 5,050 5,230 8,080 8,368 10,100 10,460 13,075 20,200 20,920 26,150 40,400 41,840 52,300 52,823 104,600 105,646 209,200 211,292 264,115 422,584 528,230 845,168 1,056,460 1,320,575 2,112,920 2,641,150 4,225,840 5,282,300 10,564,600 and 21,129,200, with no remainder.

Since 21,129,200 cannot be divided by just 1 and 21,129,200, 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).