21367365 has 16 divisors (see below), whose sum is σ = 34509888. Its totient is φ = 11288576.

The previous prime is 21367331. The next prime is 21367393. The reversal of 21367365 is 56376312.

It is a cyclic number.

It is not a de Polignac number, because 21367365 - 2¹⁸ = 21105221 is a prime.

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, 5052 + ... + 8261.

It is an arithmetic number, because the mean of its divisors is an integer number (2156868).

Almost surely, 2^21367365 is an apocalyptic number.

It is an amenable number.

21367365 is a deficient number, since it is larger than the sum of its proper divisors (13142523).

21367365 is a wasteful number, since it uses less digits than its factorization.

21367365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428.

The product of its digits is 22680, while the sum is 33.

The square root of 21367365 is about 4622.4847214458. The cubic root of 21367365 is about 277.4919078884.

The spelling of 21367365 in words is "twenty-one million, three hundred sixty-seven thousand, three hundred sixty-five".