21083886 has 24 divisors (see below), whose sum is σ = 46458360. Its totient is φ = 6908496.

The previous prime is 21083869. The next prime is 21083891. The reversal of 21083886 is 68838012.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21083886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8865 + ... + 10988.

It is an arithmetic number, because the mean of its divisors is an integer number (1935765).

Almost surely, 2^21083886 is an apocalyptic number.

21083886 is an abundant number, since it is smaller than the sum of its proper divisors (25374474).

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

21083886 is a wasteful number, since it uses less digits than its factorization.

21083886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920 (or 19917 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 21083886 is about 4591.7192858449. The cubic root of 21083886 is about 276.2592868987.

The spelling of 21083886 in words is "twenty-one million, eighty-three thousand, eight hundred eighty-six".