21055052 has 12 divisors (see below), whose sum is σ = 36936816. Its totient is φ = 10501680.

The previous prime is 21055043. The next prime is 21055063. The reversal of 21055052 is 25055012.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

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, 4568 + ... + 7935.

It is an arithmetic number, because the mean of its divisors is an integer number (3078068).

Almost surely, 2^21055052 is an apocalyptic number.

It is an amenable number.

21055052 is a deficient number, since it is larger than the sum of its proper divisors (15881764).

21055052 is a wasteful number, since it uses less digits than its factorization.

21055052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12928 (or 12926 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 21055052 is about 4588.5784290998. The cubic root of 21055052 is about 276.1332934539.

The spelling of 21055052 in words is "twenty-one million, fifty-five thousand, fifty-two".