21604212403204 has 48 divisors (see below), whose sum is σ = 39582565456896. Its totient is φ = 10298041380000.

The previous prime is 21604212403199. The next prime is 21604212403229. The reversal of 21604212403204 is 40230421240612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680410329 + ... + 680442079.

It is an arithmetic number, because the mean of its divisors is an integer number (824636780352).

Almost surely, 2^{21604212403204} is an apocalyptic number.

It is an amenable number.

21604212403204 is a deficient number, since it is larger than the sum of its proper divisors (17978353053692).

21604212403204 is a wasteful number, since it uses less digits than its factorization.

21604212403204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56176 (or 56174 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21604212403204 its reverse (40230421240612), we get a palindrome (61834633643816).

The spelling of 21604212403204 in words is "twenty-one trillion, six hundred four billion, two hundred twelve million, four hundred three thousand, two hundred four".