21220012204 has 12 divisors (see below), whose sum is σ = 39319434504. Its totient is φ = 9985888064.

The previous prime is 21220012201. The next prime is 21220012207. The reversal of 21220012204 is 40221002212.

It is an interprime number because it is at equal distance from previous prime (21220012201) and next prime (21220012207).

It is not an unprimeable number, because it can be changed into a prime (21220012201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156029434 + ... + 156029569.

It is an arithmetic number, because the mean of its divisors is an integer number (3276619542).

Almost surely, 2^21220012204 is an apocalyptic number.

It is an amenable number.

21220012204 is a deficient number, since it is larger than the sum of its proper divisors (18099422300).

21220012204 is a wasteful number, since it uses less digits than its factorization.

21220012204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312059024 (or 312059022 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220012204 its reverse (40221002212), we get a palindrome (61441014416).

The spelling of 21220012204 in words is "twenty-one billion, two hundred twenty million, twelve thousand, two hundred four".