21311110323 has 6 divisors (see below), whose sum is σ = 30782714924. Its totient is φ = 14207406876.

The previous prime is 21311110309. The next prime is 21311110333. The reversal of 21311110323 is 32301111312.

21311110323 is a `hidden beast` number, since 21 + 311 + 1 + 10 + 323 = 666.

It is not a de Polignac number, because 21311110323 - 2¹² = 21311106227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311110296 and 21311110305.

It is not an unprimeable number, because it can be changed into a prime (21311110333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183950565 + ... + 1183950582.

Almost surely, 2^21311110323 is an apocalyptic number.

21311110323 is a deficient number, since it is larger than the sum of its proper divisors (9471604601).

21311110323 is a wasteful number, since it uses less digits than its factorization.

21311110323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367901153 (or 2367901150 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21311110323 its reverse (32301111312), we get a palindrome (53612221635).

The spelling of 21311110323 in words is "twenty-one billion, three hundred eleven million, one hundred ten thousand, three hundred twenty-three".