21472732 has 12 divisors (see below), whose sum is σ = 38193736. Its totient is φ = 10560240.

The previous prime is 21472729. The next prime is 21472741. The reversal of 21472732 is 23727412.

It is a super-2 number, since 2×21472732² = 922156439087648, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21472732.

It is a congruent number.

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, 43758 + ... + 44245.

Almost surely, 2^21472732 is an apocalyptic number.

It is an amenable number.

21472732 is a deficient number, since it is larger than the sum of its proper divisors (16721004).

21472732 is a wasteful number, since it uses less digits than its factorization.

21472732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88068 (or 88066 counting only the distinct ones).

The product of its digits is 4704, while the sum is 28.

The square root of 21472732 is about 4633.8679307896. The cubic root of 21472732 is about 277.9472839677.

The spelling of 21472732 in words is "twenty-one million, four hundred seventy-two thousand, seven hundred thirty-two".