21572672 has 28 divisors (see below), whose sum is σ = 46701456. Its totient is φ = 9805440.

The previous prime is 21572659. The next prime is 21572693. The reversal of 21572672 is 27627512.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14618 + ... + 16025.

Almost surely, 2^21572672 is an apocalyptic number.

21572672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21572672 is an abundant number, since it is smaller than the sum of its proper divisors (25128784).

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

21572672 is a wasteful number, since it uses less digits than its factorization.

21572672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30666 (or 30656 counting only the distinct ones).

The product of its digits is 11760, while the sum is 32.

The square root of 21572672 is about 4644.6390602500. The cubic root of 21572672 is about 278.3778310616.

The spelling of 21572672 in words is "twenty-one million, five hundred seventy-two thousand, six hundred seventy-two".