21100204102404 has 96 divisors (see below), whose sum is σ = 59578333436160. Its totient is φ = 5673881935872.

The previous prime is 21100204102363. The next prime is 21100204102457. The reversal of 21100204102404 is 40420140200112.

It is a super-2 number, since 2×21100204102404² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80135014 + ... + 80397890.

It is an arithmetic number, because the mean of its divisors is an integer number (620607639960).

Almost surely, 2^{21100204102404} is an apocalyptic number.

It is an amenable number.

21100204102404 is an abundant number, since it is smaller than the sum of its proper divisors (38478129333756).

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

21100204102404 is a wasteful number, since it uses less digits than its factorization.

21100204102404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319117 (or 319115 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21100204102404 its reverse (40420140200112), we get a palindrome (61520344302516).

The spelling of 21100204102404 in words is "twenty-one trillion, one hundred billion, two hundred four million, one hundred two thousand, four hundred four".