21044023339 has 4 divisors (see below), whose sum is σ = 21149772400. Its totient is φ = 20938274280.

The previous prime is 21044023331. The next prime is 21044023369. The reversal of 21044023339 is 93332044012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21044023339 - 2³ = 21044023331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21044023339.

It is not an unprimeable number, because it can be changed into a prime (21044023331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52874232 + ... + 52874629.

It is an arithmetic number, because the mean of its divisors is an integer number (5287443100).

Almost surely, 2^21044023339 is an apocalyptic number.

21044023339 is a deficient number, since it is larger than the sum of its proper divisors (105749061).

21044023339 is a wasteful number, since it uses less digits than its factorization.

21044023339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105749060.

The product of its (nonzero) digits is 15552, while the sum is 31.

The spelling of 21044023339 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred thirty-nine".