21885339 has 16 divisors (see below), whose sum is σ = 33596928. Its totient is φ = 12412992.

The previous prime is 21885319. The next prime is 21885361. The reversal of 21885339 is 93358812.

It is not a de Polignac number, because 21885339 - 2¹² = 21881243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21885297 and 21885306.

It is not an unprimeable number, because it can be changed into a prime (21885319) 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, 927 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (2099808).

Almost surely, 2^21885339 is an apocalyptic number.

21885339 is a deficient number, since it is larger than the sum of its proper divisors (11711589).

21885339 is a wasteful number, since it uses less digits than its factorization.

21885339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754.

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

The square root of 21885339 is about 4678.1768884898. The cubic root of 21885339 is about 279.7162900089.

The spelling of 21885339 in words is "twenty-one million, eight hundred eighty-five thousand, three hundred thirty-nine".