21463872 has 28 divisors (see below), whose sum is σ = 56790336. Its totient is φ = 7154560.

The previous prime is 21463847. The next prime is 21463909. The reversal of 21463872 is 27836412.

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, 55704 + ... + 56087.

Almost surely, 2^21463872 is an apocalyptic number.

It is an amenable number.

21463872 is an abundant number, since it is smaller than the sum of its proper divisors (35326464).

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

21463872 is a wasteful number, since it uses less digits than its factorization.

21463872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111806 (or 111796 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 21463872 is about 4632.9118273501. The cubic root of 21463872 is about 277.9090501786.

The spelling of 21463872 in words is "twenty-one million, four hundred sixty-three thousand, eight hundred seventy-two".