21275952 has 20 divisors (see below), whose sum is σ = 54963000. Its totient is φ = 7091968.

The previous prime is 21275941. The next prime is 21275981. The reversal of 21275952 is 25957212.

It is a happy number.

It is a super-2 number, since 2×21275952² = 905332267012608, which contains 22 as substring.

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, 221577 + ... + 221672.

It is an arithmetic number, because the mean of its divisors is an integer number (2748150).

Almost surely, 2^21275952 is an apocalyptic number.

It is an amenable number.

21275952 is an abundant number, since it is smaller than the sum of its proper divisors (33687048).

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

21275952 is a wasteful number, since it uses less digits than its factorization.

21275952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443260 (or 443254 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 21275952 is about 4612.5862593560. The cubic root of 21275952 is about 277.0956239949.

The spelling of 21275952 in words is "twenty-one million, two hundred seventy-five thousand, nine hundred fifty-two".