21360791 has 8 divisors (see below), whose sum is σ = 22161600. Its totient is φ = 20564320.

The previous prime is 21360761. The next prime is 21360799. The reversal of 21360791 is 19706312.

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

It is a cyclic number.

It is not a de Polignac number, because 21360791 - 2¹⁸ = 21098647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11645 + ... + 13353.

It is an arithmetic number, because the mean of its divisors is an integer number (2770200).

Almost surely, 2^21360791 is an apocalyptic number.

21360791 is a deficient number, since it is larger than the sum of its proper divisors (800809).

21360791 is a wasteful number, since it uses less digits than its factorization.

21360791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21360791 is about 4621.7735773186. The cubic root of 21360791 is about 277.4634467450.

The spelling of 21360791 in words is "twenty-one million, three hundred sixty thousand, seven hundred ninety-one".