21339185 has 16 divisors (see below), whose sum is σ = 30806400. Its totient is φ = 13862016.

The previous prime is 21339181. The next prime is 21339209. The reversal of 21339185 is 58193312.

It is not a de Polignac number, because 21339185 - 2² = 21339181 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21339181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15380 + ... + 16709.

It is an arithmetic number, because the mean of its divisors is an integer number (1925400).

Almost surely, 2^21339185 is an apocalyptic number.

It is an amenable number.

21339185 is a deficient number, since it is larger than the sum of its proper divisors (9467215).

21339185 is a wasteful number, since it uses less digits than its factorization.

21339185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32120.

The product of its digits is 6480, while the sum is 32.

The square root of 21339185 is about 4619.4355715823. The cubic root of 21339185 is about 277.3698656662.

The spelling of 21339185 in words is "twenty-one million, three hundred thirty-nine thousand, one hundred eighty-five".