21444311412 has 24 divisors (see below), whose sum is σ = 55596363200. Its totient is φ = 7148103768.

The previous prime is 21444311389. The next prime is 21444311423. The reversal of 21444311412 is 21411344412.

21444311412 is a `hidden beast` number, since 214 + 4 + 4 + 31 + 1 + 412 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

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, 99279112 + ... + 99279327.

Almost surely, 2^21444311412 is an apocalyptic number.

It is an amenable number.

21444311412 is an abundant number, since it is smaller than the sum of its proper divisors (34152051788).

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

21444311412 is a wasteful number, since it uses less digits than its factorization.

21444311412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198558452 (or 198558444 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21444311412 its reverse (21411344412), we get a palindrome (42855655824).

The spelling of 21444311412 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, four hundred twelve".