21365385 has 8 divisors (see below), whose sum is σ = 34184640. Its totient is φ = 11394864.

The previous prime is 21365363. The next prime is 21365411. The reversal of 21365385 is 58356312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21365385 - 2⁵ = 21365353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712165 + ... + 712194.

It is an arithmetic number, because the mean of its divisors is an integer number (4273080).

Almost surely, 2^21365385 is an apocalyptic number.

It is an amenable number.

21365385 is a deficient number, since it is larger than the sum of its proper divisors (12819255).

21365385 is a wasteful number, since it uses less digits than its factorization.

21365385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424367.

The product of its digits is 21600, while the sum is 33.

The square root of 21365385 is about 4622.2705459547. The cubic root of 21365385 is about 277.4833363908.

The spelling of 21365385 in words is "twenty-one million, three hundred sixty-five thousand, three hundred eighty-five".