21221330204 has 24 divisors (see below), whose sum is σ = 39119480400. Its totient is φ = 10045123200.

The previous prime is 21221330189. The next prime is 21221330219. The reversal of 21221330204 is 40203312212.

It is an interprime number because it is at equal distance from previous prime (21221330189) and next prime (21221330219).

It is a congruent number.

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, 10904 + ... + 206304.

It is an arithmetic number, because the mean of its divisors is an integer number (1629978350).

Almost surely, 2^21221330204 is an apocalyptic number.

It is an amenable number.

21221330204 is a deficient number, since it is larger than the sum of its proper divisors (17898150196).

21221330204 is a wasteful number, since it uses less digits than its factorization.

21221330204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196853 (or 196851 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21221330204 its reverse (40203312212), we get a palindrome (61424642416).

The spelling of 21221330204 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, two hundred four".