21484272 has 40 divisors (see below), whose sum is σ = 57005776. Its totient is φ = 6967296.

The previous prime is 21484259. The next prime is 21484279. The reversal of 21484272 is 27248412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4273 + ... + 7824.

Almost surely, 2^21484272 is an apocalyptic number.

It is an amenable number.

21484272 is an abundant number, since it is smaller than the sum of its proper divisors (35521504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21484272 is a wasteful number, since it uses less digits than its factorization.

21484272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12145 (or 12139 counting only the distinct ones).

The product of its digits is 7168, while the sum is 30.

The square root of 21484272 is about 4635.1129436077. The cubic root of 21484272 is about 277.9970670636.

The spelling of 21484272 in words is "twenty-one million, four hundred eighty-four thousand, two hundred seventy-two".