21113013204 has 36 divisors (see below), whose sum is σ = 55345637984. Its totient is φ = 7037670744.

The previous prime is 21113013203. The next prime is 21113013241. The reversal of 21113013204 is 40231031112.

21113013204 is a `hidden beast` number, since 211 + 130 + 1 + 320 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113013203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10859632 + ... + 10861575.

Almost surely, 2^21113013204 is an apocalyptic number.

It is an amenable number.

21113013204 is an abundant number, since it is smaller than the sum of its proper divisors (34232624780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113013204 is a wasteful number, since it uses less digits than its factorization.

21113013204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721226 (or 21721212 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21113013204 its reverse (40231031112), we get a palindrome (61344044316).

The spelling of 21113013204 in words is "twenty-one billion, one hundred thirteen million, thirteen thousand, two hundred four".