21230022204 has 36 divisors (see below), whose sum is σ = 53964597960. Its totient is φ = 7037137440.

The previous prime is 21230022197. The next prime is 21230022223. The reversal of 21230022204 is 40222003212.

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1640827 + ... + 1653714.

It is an arithmetic number, because the mean of its divisors is an integer number (1499016610).

Almost surely, 2^21230022204 is an apocalyptic number.

It is an amenable number.

21230022204 is an abundant number, since it is smaller than the sum of its proper divisors (32734575756).

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

21230022204 is a wasteful number, since it uses less digits than its factorization.

21230022204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294730 (or 3294725 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21230022204 its reverse (40222003212), we get a palindrome (61452025416).

The spelling of 21230022204 in words is "twenty-one billion, two hundred thirty million, twenty-two thousand, two hundred four".