21379085 has 32 divisors (see below), whose sum is σ = 33250560. Its totient is φ = 12814848.

The previous prime is 21379067. The next prime is 21379093. The reversal of 21379085 is 58097312.

It is a cyclic number.

It is not a de Polignac number, because 21379085 - 2⁶ = 21379021 is a prime.

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

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 31 ways as a sum of consecutive naturals, for example, 7409 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (1039080).

Almost surely, 2^21379085 is an apocalyptic number.

It is an amenable number.

21379085 is a deficient number, since it is larger than the sum of its proper divisors (11871475).

21379085 is a wasteful number, since it uses less digits than its factorization.

21379085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 21379085 is about 4623.7522641249. The cubic root of 21379085 is about 277.5426333870.

The spelling of 21379085 in words is "twenty-one million, three hundred seventy-nine thousand, eighty-five".