21076685 has 16 divisors (see below), whose sum is σ = 30606336. Its totient is φ = 13602048.

The previous prime is 21076667. The next prime is 21076691. The reversal of 21076685 is 58667012.

It is a cyclic number.

It is not a de Polignac number, because 21076685 - 2¹⁰ = 21075661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17117 + ... + 18306.

It is an arithmetic number, because the mean of its divisors is an integer number (1912896).

Almost surely, 2^21076685 is an apocalyptic number.

It is an amenable number.

21076685 is a deficient number, since it is larger than the sum of its proper divisors (9529651).

21076685 is a wasteful number, since it uses less digits than its factorization.

21076685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35452.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 21076685 is about 4590.9350899354. The cubic root of 21076685 is about 276.2278320766.

The spelling of 21076685 in words is "twenty-one million, seventy-six thousand, six hundred eighty-five".