21764156 has 12 divisors (see below), whose sum is σ = 38733240. Its totient is φ = 10697520.

The previous prime is 21764143. The next prime is 21764179. The reversal of 21764156 is 65146712.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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, 45875 + ... + 46346.

It is an arithmetic number, because the mean of its divisors is an integer number (3227770).

Almost surely, 2^21764156 is an apocalyptic number.

It is an amenable number.

21764156 is a deficient number, since it is larger than the sum of its proper divisors (16969084).

21764156 is a wasteful number, since it uses less digits than its factorization.

21764156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92284 (or 92282 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 21764156 is about 4665.2069621829. The cubic root of 21764156 is about 279.1990546023.

The spelling of 21764156 in words is "twenty-one million, seven hundred sixty-four thousand, one hundred fifty-six".