21336959 has 8 divisors (see below), whose sum is σ = 25171968. Its totient is φ = 17698680.

The previous prime is 21336907. The next prime is 21336961. The reversal of 21336959 is 95963312.

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 21336959 - 2¹⁶ = 21271423 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 (21336559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48947 + ... + 49380.

It is an arithmetic number, because the mean of its divisors is an integer number (3146496).

Almost surely, 2^21336959 is an apocalyptic number.

21336959 is a deficient number, since it is larger than the sum of its proper divisors (3835009).

21336959 is an equidigital number, since it uses as much as digits as its factorization.

21336959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98365.

The product of its digits is 43740, while the sum is 38.

The square root of 21336959 is about 4619.1946267721. The cubic root of 21336959 is about 277.3602207056.

The spelling of 21336959 in words is "twenty-one million, three hundred thirty-six thousand, nine hundred fifty-nine".