21422031204 has 48 divisors (see below), whose sum is σ = 58203266688. Its totient is φ = 6005096448.

The previous prime is 21422031139. The next prime is 21422031217. The reversal of 21422031204 is 40213022412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2401437 + ... + 2410340.

It is an arithmetic number, because the mean of its divisors is an integer number (1212568056).

Almost surely, 2^21422031204 is an apocalyptic number.

It is an amenable number.

21422031204 is an abundant number, since it is smaller than the sum of its proper divisors (36781235484).

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

21422031204 is a wasteful number, since it uses less digits than its factorization.

21422031204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811844 (or 4811842 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21422031204 its reverse (40213022412), we get a palindrome (61635053616).

The spelling of 21422031204 in words is "twenty-one billion, four hundred twenty-two million, thirty-one thousand, two hundred four".