21073086 has 12 divisors (see below), whose sum is σ = 45658392. Its totient is φ = 7024356.

The previous prime is 21073069. The next prime is 21073093. The reversal of 21073086 is 68037012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 585346 + ... + 585381.

It is an arithmetic number, because the mean of its divisors is an integer number (3804866).

Almost surely, 2^21073086 is an apocalyptic number.

21073086 is an abundant number, since it is smaller than the sum of its proper divisors (24585306).

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

21073086 is a wasteful number, since it uses less digits than its factorization.

21073086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170735 (or 1170732 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21073086 is about 4590.5431051238. The cubic root of 21073086 is about 276.2121085325.

The spelling of 21073086 in words is "twenty-one million, seventy-three thousand, eighty-six".