21338317 has 16 divisors (see below), whose sum is σ = 28651392. Its totient is φ = 15347520.

The previous prime is 21338299. The next prime is 21338321. The reversal of 21338317 is 71383312.

It is a cyclic number.

It is not a de Polignac number, because 21338317 - 2⁷ = 21338189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9658 + ... + 11659.

It is an arithmetic number, because the mean of its divisors is an integer number (1790712).

Almost surely, 2^21338317 is an apocalyptic number.

It is an amenable number.

21338317 is a deficient number, since it is larger than the sum of its proper divisors (7313075).

21338317 is a wasteful number, since it uses less digits than its factorization.

21338317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21348.

The product of its digits is 3024, while the sum is 28.

The square root of 21338317 is about 4619.3416197549. The cubic root of 21338317 is about 277.3661048179.

The spelling of 21338317 in words is "twenty-one million, three hundred thirty-eight thousand, three hundred seventeen".