21111794839 has 8 divisors (see below), whose sum is σ = 21608010512. Its totient is φ = 20615817600.

The previous prime is 21111794807. The next prime is 21111794849. The reversal of 21111794839 is 93849711112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21111794839 - 2⁵ = 21111794807 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 (21111794849) 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 7 ways as a sum of consecutive naturals, for example, 126289 + ... + 241189.

It is an arithmetic number, because the mean of its divisors is an integer number (2701001314).

Almost surely, 2^21111794839 is an apocalyptic number.

21111794839 is a deficient number, since it is larger than the sum of its proper divisors (496215673).

21111794839 is a wasteful number, since it uses less digits than its factorization.

21111794839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119217.

The product of its digits is 108864, while the sum is 46.

The spelling of 21111794839 in words is "twenty-one billion, one hundred eleven million, seven hundred ninety-four thousand, eight hundred thirty-nine".