21536974 has 16 divisors (see below), whose sum is σ = 33112800. Its totient is φ = 10501920.

The previous prime is 21536953. The next prime is 21536989. The reversal of 21536974 is 47963512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20584 + ... + 21604.

It is an arithmetic number, because the mean of its divisors is an integer number (2069550).

Almost surely, 2^21536974 is an apocalyptic number.

21536974 is a deficient number, since it is larger than the sum of its proper divisors (11575826).

21536974 is a wasteful number, since it uses less digits than its factorization.

21536974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275.

The product of its digits is 45360, while the sum is 37.

The square root of 21536974 is about 4640.7945440409. The cubic root of 21536974 is about 278.2241950427.

The spelling of 21536974 in words is "twenty-one million, five hundred thirty-six thousand, nine hundred seventy-four".