21839204 has 24 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 10361120.

The previous prime is 21839197. The next prime is 21839219. The reversal of 21839204 is 40293812.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 5249 + ... + 8439.

It is an arithmetic number, because the mean of its divisors is an integer number (1675800).

Almost surely, 2^21839204 is an apocalyptic number.

It is an amenable number.

21839204 is a deficient number, since it is larger than the sum of its proper divisors (18379996).

21839204 is a wasteful number, since it uses less digits than its factorization.

21839204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283 (or 3281 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21839204 is about 4673.2434133052. The cubic root of 21839204 is about 279.5196014172.

The spelling of 21839204 in words is "twenty-one million, eight hundred thirty-nine thousand, two hundred four".