21974264 has 16 divisors (see below), whose sum is σ = 44371320. Its totient is φ = 10141920.

The previous prime is 21974261. The next prime is 21974273. The reversal of 21974264 is 46247912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105542 + ... + 105749.

Almost surely, 2^21974264 is an apocalyptic number.

It is an amenable number.

21974264 is an abundant number, since it is smaller than the sum of its proper divisors (22397056).

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

21974264 is a wasteful number, since it uses less digits than its factorization.

21974264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211310 (or 211306 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 21974264 is about 4687.6714901964. The cubic root of 21974264 is about 280.0946278802.

The spelling of 21974264 in words is "twenty-one million, nine hundred seventy-four thousand, two hundred sixty-four".