21672783733939 has 4 divisors (see below), whose sum is σ = 23339920944256. Its totient is φ = 20005646523624.

The previous prime is 21672783733927. The next prime is 21672783733967. The reversal of 21672783733939 is 93933738727612.

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 21672783733939 - 2⁵ = 21672783733907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21672783733039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833568605139 + ... + 833568605164.

It is an arithmetic number, because the mean of its divisors is an integer number (5834980236064).

Almost surely, 2^{21672783733939} is an apocalyptic number.

21672783733939 is a deficient number, since it is larger than the sum of its proper divisors (1667137210317).

21672783733939 is a wasteful number, since it uses less digits than its factorization.

21672783733939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667137210316.

The product of its digits is 432081216, while the sum is 70.

The spelling of 21672783733939 in words is "twenty-one trillion, six hundred seventy-two billion, seven hundred eighty-three million, seven hundred thirty-three thousand, nine hundred thirty-nine".