21444344204 has 72 divisors (see below), whose sum is σ = 40855742928. Its totient is φ = 9814005760.

The previous prime is 21444344203. The next prime is 21444344287. The reversal of 21444344204 is 40244344412.

It is not an unprimeable number, because it can be changed into a prime (21444344203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25022144 + ... + 25023000.

It is an arithmetic number, because the mean of its divisors is an integer number (567440874).

Almost surely, 2^21444344204 is an apocalyptic number.

It is an amenable number.

21444344204 is a deficient number, since it is larger than the sum of its proper divisors (19411398724).

21444344204 is a wasteful number, since it uses less digits than its factorization.

21444344204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21444344204 its reverse (40244344412), we get a palindrome (61688688616).

The spelling of 21444344204 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-four thousand, two hundred four".