21104204 has 24 divisors (see below), whose sum is σ = 40452048. Its totient is φ = 9554240.

The previous prime is 21104203. The next prime is 21104221. The reversal of 21104204 is 40240112.

It is not an unprimeable number, because it can be changed into a prime (21104203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12074 + ... + 13710.

It is an arithmetic number, because the mean of its divisors is an integer number (1685502).

Almost surely, 2^21104204 is an apocalyptic number.

It is an amenable number.

21104204 is a deficient number, since it is larger than the sum of its proper divisors (19347844).

21104204 is a wasteful number, since it uses less digits than its factorization.

21104204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21104204 is about 4593.9312141128. The cubic root of 21104204 is about 276.3479997370.

Adding to 21104204 its reverse (40240112), we get a palindrome (61344316).

The spelling of 21104204 in words is "twenty-one million, one hundred four thousand, two hundred four".