21903452 has 12 divisors (see below), whose sum is σ = 39997776. Its totient is φ = 10475520.

The previous prime is 21903449. The next prime is 21903487. The reversal of 21903452 is 25430912.

It is a super-2 number, since 2×21903452² = 959522419032608, which contains 22 as substring.

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, 118949 + ... + 119132.

It is an arithmetic number, because the mean of its divisors is an integer number (3333148).

Almost surely, 2^21903452 is an apocalyptic number.

It is an amenable number.

21903452 is a deficient number, since it is larger than the sum of its proper divisors (18094324).

21903452 is a wasteful number, since it uses less digits than its factorization.

21903452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238108 (or 238106 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21903452 is about 4680.1123918128. The cubic root of 21903452 is about 279.7934360848.

The spelling of 21903452 in words is "twenty-one million, nine hundred three thousand, four hundred fifty-two".