21313112111 has 8 divisors (see below), whose sum is σ = 21429743424. Its totient is φ = 21196766880.

The previous prime is 21313112099. The next prime is 21313112147. The reversal of 21313112111 is 11121131312.

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 21313112111 - 2²² = 21308917807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313112911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78746 + ... + 220968.

It is an arithmetic number, because the mean of its divisors is an integer number (2678717928).

Almost surely, 2^21313112111 is an apocalyptic number.

21313112111 is a deficient number, since it is larger than the sum of its proper divisors (116631313).

21313112111 is a wasteful number, since it uses less digits than its factorization.

21313112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143041.

The product of its digits is 36, while the sum is 17.

Adding to 21313112111 its reverse (11121131312), we get a palindrome (32434243423).

The spelling of 21313112111 in words is "twenty-one billion, three hundred thirteen million, one hundred twelve thousand, one hundred eleven".