21674839923 has 16 divisors (see below), whose sum is σ = 35030044800. Its totient is φ = 13136266440.

The previous prime is 21674839861. The next prime is 21674839933. The reversal of 21674839923 is 32993847612.

It is not a de Polignac number, because 21674839923 - 2¹⁴ = 21674823539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21674839923.

It is not an unprimeable number, because it can be changed into a prime (21674839933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36489333 + ... + 36489926.

It is an arithmetic number, because the mean of its divisors is an integer number (2189377800).

Almost surely, 2^21674839923 is an apocalyptic number.

21674839923 is a deficient number, since it is larger than the sum of its proper divisors (13355204877).

21674839923 is a wasteful number, since it uses less digits than its factorization.

21674839923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72979279 (or 72979273 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 21674839923 in words is "twenty-one billion, six hundred seventy-four million, eight hundred thirty-nine thousand, nine hundred twenty-three".