Q: Is 21,471,520 a Composite Number?

Why is 21,471,520 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 21,471,520 can be evenly divided by 1 2 4 5 7 8 10 14 16 19 20 28 32 35 38 40 56 70 76 80 95 112 133 140 152 160 190 224 266 280 304 380 532 560 608 665 760 1,009 1,064 1,120 1,330 1,520 2,018 2,128 2,660 3,040 4,036 4,256 5,045 5,320 7,063 8,072 10,090 10,640 14,126 16,144 19,171 20,180 21,280 28,252 32,288 35,315 38,342 40,360 56,504 70,630 76,684 80,720 95,855 113,008 134,197 141,260 153,368 161,440 191,710 226,016 268,394 282,520 306,736 383,420 536,788 565,040 613,472 670,985 766,840 1,073,576 1,130,080 1,341,970 1,533,680 2,147,152 2,683,940 3,067,360 4,294,304 5,367,880 10,735,760 and 21,471,520, with no remainder.

Since 21,471,520 cannot be divided by just 1 and 21,471,520, 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).