21471672 has 32 divisors (see below), whose sum is σ = 56505600. Its totient is φ = 6780384.

The previous prime is 21471661. The next prime is 21471677. The reversal of 21471672 is 27617412.

It is a super-2 number, since 2×21471672² = 922065396951168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23088 + ... + 23999.

It is an arithmetic number, because the mean of its divisors is an integer number (1765800).

Almost surely, 2^21471672 is an apocalyptic number.

It is an amenable number.

21471672 is an abundant number, since it is smaller than the sum of its proper divisors (35033928).

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

21471672 is a wasteful number, since it uses less digits than its factorization.

21471672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47115 (or 47111 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 21471672 is about 4633.7535540855. The cubic root of 21471672 is about 277.9427102760.

The spelling of 21471672 in words is "twenty-one million, four hundred seventy-one thousand, six hundred seventy-two".