21221102100204 has 24 divisors (see below), whose sum is σ = 55017672111920. Its totient is φ = 7073700700032.

The previous prime is 21221102100157. The next prime is 21221102100239. The reversal of 21221102100204 is 40200120112212.

21221102100204 is a `hidden beast` number, since 21 + 221 + 10 + 210 + 0 + 204 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98245842949 + ... + 98245843164.

Almost surely, 2^{21221102100204} is an apocalyptic number.

It is an amenable number.

21221102100204 is an abundant number, since it is smaller than the sum of its proper divisors (33796570011716).

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

21221102100204 is a wasteful number, since it uses less digits than its factorization.

21221102100204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196491686126 (or 196491686118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221102100204 its reverse (40200120112212), we get a palindrome (61421222212416).

The spelling of 21221102100204 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred four".