21444212439 has 36 divisors (see below), whose sum is σ = 33625547280. Its totient is φ = 13163155200.

The previous prime is 21444212389. The next prime is 21444212443. The reversal of 21444212439 is 93421244412.

21444212439 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 4 + 212 + 439 = 666.

It is not a de Polignac number, because 21444212439 - 2⁸ = 21444212183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444212479) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 592342 + ... + 627500.

It is an arithmetic number, because the mean of its divisors is an integer number (934042980).

Almost surely, 2^21444212439 is an apocalyptic number.

21444212439 is a deficient number, since it is larger than the sum of its proper divisors (12181334841).

21444212439 is a wasteful number, since it uses less digits than its factorization.

21444212439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35592 (or 35576 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The spelling of 21444212439 in words is "twenty-one billion, four hundred forty-four million, two hundred twelve thousand, four hundred thirty-nine".