21086052 has 48 divisors (see below), whose sum is σ = 56109312. Its totient is φ = 6105600.

The previous prime is 21086027. The next prime is 21086089. The reversal of 21086052 is 25068012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (1168944).

Almost surely, 2^21086052 is an apocalyptic number.

It is an amenable number.

21086052 is an abundant number, since it is smaller than the sum of its proper divisors (35023260).

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

21086052 is a wasteful number, since it uses less digits than its factorization.

21086052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7988 (or 7986 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21086052 is about 4591.9551391537. The cubic root of 21086052 is about 276.2687468424.

The spelling of 21086052 in words is "twenty-one million, eighty-six thousand, fifty-two".