21373367 has 4 divisors (see below), whose sum is σ = 21398616. Its totient is φ = 21348120.

The previous prime is 21373361. The next prime is 21373379. The reversal of 21373367 is 76337312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21373367 - 2⁴ = 21373351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11309 + ... + 13062.

It is an arithmetic number, because the mean of its divisors is an integer number (5349654).

Almost surely, 2^21373367 is an apocalyptic number.

21373367 is a deficient number, since it is larger than the sum of its proper divisors (25249).

21373367 is an equidigital number, since it uses as much as digits as its factorization.

21373367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25248.

The product of its digits is 15876, while the sum is 32.

The square root of 21373367 is about 4623.1338937997. The cubic root of 21373367 is about 277.5178875465.

The spelling of 21373367 in words is "twenty-one million, three hundred seventy-three thousand, three hundred sixty-seven".