21714564 has 24 divisors (see below), whose sum is σ = 51746688. Its totient is φ = 7084000.

The previous prime is 21714547. The next prime is 21714571. The reversal of 21714564 is 46541712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18687 + ... + 19814.

It is an arithmetic number, because the mean of its divisors is an integer number (2156112).

Almost surely, 2^21714564 is an apocalyptic number.

It is an amenable number.

21714564 is an abundant number, since it is smaller than the sum of its proper divisors (30032124).

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

21714564 is a wasteful number, since it uses less digits than its factorization.

21714564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38555 (or 38553 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 21714564 is about 4659.8888398759. Note that the first 4 decimals coincide. The cubic root of 21714564 is about 278.9868315106.

The spelling of 21714564 in words is "twenty-one million, seven hundred fourteen thousand, five hundred sixty-four".