21314872 has 16 divisors (see below), whose sum is σ = 42316560. Its totient is φ = 10030464.

The previous prime is 21314861. The next prime is 21314893. The reversal of 21314872 is 27841312.

It is a self number, because there is not a number n which added to its sum of digits gives 21314872.

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, 78228 + ... + 78499.

It is an arithmetic number, because the mean of its divisors is an integer number (2644785).

Almost surely, 2^21314872 is an apocalyptic number.

It is an amenable number.

21314872 is a deficient number, since it is larger than the sum of its proper divisors (21001688).

21314872 is a wasteful number, since it uses less digits than its factorization.

21314872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156750 (or 156746 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 21314872 is about 4616.8032230105. The cubic root of 21314872 is about 277.2644843168.

The spelling of 21314872 in words is "twenty-one million, three hundred fourteen thousand, eight hundred seventy-two".