21938753879 has 12 divisors (see below), whose sum is σ = 25527051000. Its totient is φ = 18799886448.

The previous prime is 21938753867. The next prime is 21938753923. The reversal of 21938753879 is 97835783912.

It is a de Polignac number, because none of the positive numbers 2^k-21938753879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938755879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146237 + ... + 255465.

It is an arithmetic number, because the mean of its divisors is an integer number (2127254250).

Almost surely, 2^21938753879 is an apocalyptic number.

21938753879 is a deficient number, since it is larger than the sum of its proper divisors (3588297121).

21938753879 is a wasteful number, since it uses less digits than its factorization.

21938753879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113342 (or 113335 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 62.

The spelling of 21938753879 in words is "twenty-one billion, nine hundred thirty-eight million, seven hundred fifty-three thousand, eight hundred seventy-nine".