21444004212 has 12 divisors (see below), whose sum is σ = 50036009856. Its totient is φ = 7148001400.

The previous prime is 21444004193. The next prime is 21444004261. The reversal of 21444004212 is 21240044412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893500164 + ... + 893500187.

It is an arithmetic number, because the mean of its divisors is an integer number (4169667488).

Almost surely, 2^21444004212 is an apocalyptic number.

It is an amenable number.

21444004212 is an abundant number, since it is smaller than the sum of its proper divisors (28592005644).

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

21444004212 is a wasteful number, since it uses less digits than its factorization.

21444004212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787000358 (or 1787000356 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21444004212 its reverse (21240044412), we get a palindrome (42684048624).

The spelling of 21444004212 in words is "twenty-one billion, four hundred forty-four million, four thousand, two hundred twelve".