21086934 has 16 divisors (see below), whose sum is σ = 46008000. Its totient is φ = 6389960.

The previous prime is 21086921. The next prime is 21086957. The reversal of 21086934 is 43968012.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21086895 and 21086904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159684 + ... + 159815.

It is an arithmetic number, because the mean of its divisors is an integer number (2875500).

Almost surely, 2^21086934 is an apocalyptic number.

21086934 is an abundant number, since it is smaller than the sum of its proper divisors (24921066).

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

21086934 is a wasteful number, since it uses less digits than its factorization.

21086934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319515.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21086934 is about 4592.0511756730. The cubic root of 21086934 is about 276.2725987668.

The spelling of 21086934 in words is "twenty-one million, eighty-six thousand, nine hundred thirty-four".