21534704 has 20 divisors (see below), whose sum is σ = 43163160. Its totient is φ = 10395840.

The previous prime is 21534683. The next prime is 21534727. The reversal of 21534704 is 40743512.

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, 22742 + ... + 23669.

It is an arithmetic number, because the mean of its divisors is an integer number (2158158).

Almost surely, 2^21534704 is an apocalyptic number.

It is an amenable number.

21534704 is an abundant number, since it is smaller than the sum of its proper divisors (21628456).

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

21534704 is a wasteful number, since it uses less digits than its factorization.

21534704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46448 (or 46442 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21534704 is about 4640.5499674069. The cubic root of 21534704 is about 278.2144197432.

The spelling of 21534704 in words is "twenty-one million, five hundred thirty-four thousand, seven hundred four".