21211313204 has 24 divisors (see below), whose sum is σ = 37853040960. Its totient is φ = 10398203136.

The previous prime is 21211313177. The next prime is 21211313209. The reversal of 21211313204 is 40231311212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211313209) 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, 213944 + ... + 296975.

It is an arithmetic number, because the mean of its divisors is an integer number (1577210040).

Almost surely, 2^21211313204 is an apocalyptic number.

It is an amenable number.

21211313204 is a deficient number, since it is larger than the sum of its proper divisors (16641727756).

21211313204 is a wasteful number, since it uses less digits than its factorization.

21211313204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511127 (or 511125 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21211313204 its reverse (40231311212), we get a palindrome (61442624416).

The spelling of 21211313204 in words is "twenty-one billion, two hundred eleven million, three hundred thirteen thousand, two hundred four".