21065052 has 12 divisors (see below), whose sum is σ = 49151816. Its totient is φ = 7021680.

The previous prime is 21065041. The next prime is 21065059. The reversal of 21065052 is 25056012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21065059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877699 + ... + 877722.

Almost surely, 2^21065052 is an apocalyptic number.

It is an amenable number.

21065052 is an abundant number, since it is smaller than the sum of its proper divisors (28086764).

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

21065052 is a wasteful number, since it uses less digits than its factorization.

21065052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755428 (or 1755426 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21065052 is about 4589.6679618465. The cubic root of 21065052 is about 276.1770026136.

The spelling of 21065052 in words is "twenty-one million, sixty-five thousand, fifty-two".