21339359 has 4 divisors (see below), whose sum is σ = 21348600. Its totient is φ = 21330120.

The previous prime is 21339349. The next prime is 21339371. The reversal of 21339359 is 95393312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21339359 - 2⁸ = 21339103 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339349) 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, 2204 + ... + 6894.

It is an arithmetic number, because the mean of its divisors is an integer number (5337150).

Almost surely, 2^21339359 is an apocalyptic number.

21339359 is a deficient number, since it is larger than the sum of its proper divisors (9241).

21339359 is an equidigital number, since it uses as much as digits as its factorization.

21339359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240.

The product of its digits is 21870, while the sum is 35.

The square root of 21339359 is about 4619.4544050136. The cubic root of 21339359 is about 277.3706195566.

The spelling of 21339359 in words is "twenty-one million, three hundred thirty-nine thousand, three hundred fifty-nine".