21663192 has 32 divisors (see below), whose sum is σ = 57009600. Its totient is φ = 6840864.

The previous prime is 21663181. The next prime is 21663209. The reversal of 21663192 is 29136612.

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, 23298 + ... + 24209.

It is an arithmetic number, because the mean of its divisors is an integer number (1781550).

Almost surely, 2^21663192 is an apocalyptic number.

It is an amenable number.

21663192 is an abundant number, since it is smaller than the sum of its proper divisors (35346408).

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

21663192 is a wasteful number, since it uses less digits than its factorization.

21663192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47535 (or 47531 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 21663192 is about 4654.3734272187. The cubic root of 21663192 is about 278.7666501212.

It can be divided in two parts, 2166319 and 2, that added together give a triangular number (2166321 = T₂₀₈₁).

The spelling of 21663192 in words is "twenty-one million, six hundred sixty-three thousand, one hundred ninety-two".