21238379694 has 48 divisors (see below), whose sum is σ = 54011644128. Its totient is φ = 5904104256.

The previous prime is 21238379677. The next prime is 21238379707. The reversal of 21238379694 is 49697383212.

It is a super-3 number, since 3×21238379694³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21238379694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2273157 + ... + 2282480.

It is an arithmetic number, because the mean of its divisors is an integer number (1125242586).

Almost surely, 2^21238379694 is an apocalyptic number.

21238379694 is an abundant number, since it is smaller than the sum of its proper divisors (32773264434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21238379694 is a wasteful number, since it uses less digits than its factorization.

21238379694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555689 (or 4555686 counting only the distinct ones).

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

The spelling of 21238379694 in words is "twenty-one billion, two hundred thirty-eight million, three hundred seventy-nine thousand, six hundred ninety-four".