21464668 has 6 divisors (see below), whose sum is σ = 37563176. Its totient is φ = 10732332.

The previous prime is 21464657. The next prime is 21464671. The reversal of 21464668 is 86646412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2683080 + ... + 2683087.

Almost surely, 2^21464668 is an apocalyptic number.

It is an amenable number.

21464668 is a deficient number, since it is larger than the sum of its proper divisors (16098508).

21464668 is a wasteful number, since it uses less digits than its factorization.

21464668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366171 (or 5366169 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 21464668 is about 4632.9977336493. The cubic root of 21464668 is about 277.9124856083.

The spelling of 21464668 in words is "twenty-one million, four hundred sixty-four thousand, six hundred sixty-eight".