21338895 has 8 divisors (see below), whose sum is σ = 34142256. Its totient is φ = 11380736.

The previous prime is 21338873. The next prime is 21338929. The reversal of 21338895 is 59883312.

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 21338895 - 2⁶ = 21338831 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 711282 + ... + 711311.

It is an arithmetic number, because the mean of its divisors is an integer number (4267782).

Almost surely, 2^21338895 is an apocalyptic number.

21338895 is a deficient number, since it is larger than the sum of its proper divisors (12803361).

21338895 is a wasteful number, since it uses less digits than its factorization.

21338895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422601.

The product of its digits is 51840, while the sum is 39.

The square root of 21338895 is about 4619.4041823595. The cubic root of 21338895 is about 277.3686091729.

The spelling of 21338895 in words is "twenty-one million, three hundred thirty-eight thousand, eight hundred ninety-five".