21055332 has 24 divisors (see below), whose sum is σ = 49222656. Its totient is φ = 7005088.

The previous prime is 21055319. The next prime is 21055343. The reversal of 21055332 is 23355012.

It is a junction number, because it is equal to n+sod(n) for n = 21055299 and 21055308.

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, 6493 + ... + 9179.

It is an arithmetic number, because the mean of its divisors is an integer number (2050944).

Almost surely, 2^21055332 is an apocalyptic number.

It is an amenable number.

21055332 is an abundant number, since it is smaller than the sum of its proper divisors (28167324).

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

21055332 is a wasteful number, since it uses less digits than its factorization.

21055332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347 (or 3345 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21055332 is about 4588.6089395371. The cubic root of 21055332 is about 276.1345174987.

The spelling of 21055332 in words is "twenty-one million, fifty-five thousand, three hundred thirty-two".