21904652 has 24 divisors (see below), whose sum is σ = 47792640. Its totient is φ = 8534160.

The previous prime is 21904643. The next prime is 21904691. The reversal of 21904652 is 25640912.

It is a happy number.

It is a super-2 number, since 2×21904652² = 959627558482208, which contains 22 as substring.

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, 35252 + ... + 35867.

It is an arithmetic number, because the mean of its divisors is an integer number (1991360).

Almost surely, 2^21904652 is an apocalyptic number.

21904652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21904652 is an abundant number, since it is smaller than the sum of its proper divisors (25887988).

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

21904652 is a wasteful number, since it uses less digits than its factorization.

21904652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71141 (or 71139 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21904652 is about 4680.2405921064. The cubic root of 21904652 is about 279.7985455685.

The spelling of 21904652 in words is "twenty-one million, nine hundred four thousand, six hundred fifty-two".