21311112323 has 8 divisors (see below), whose sum is σ = 22246327296. Its totient is φ = 20376617800.

The previous prime is 21311112299. The next prime is 21311112341. The reversal of 21311112323 is 32321111312.

It is a happy number.

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 21311112323 - 2¹² = 21311108227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311112295 and 21311112304.

It is not an unprimeable number, because it can be changed into a prime (21311112023) 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, 119213 + ... + 238398.

It is an arithmetic number, because the mean of its divisors is an integer number (2780790912).

Almost surely, 2^21311112323 is an apocalyptic number.

21311112323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21311112323 is a deficient number, since it is larger than the sum of its proper divisors (935214973).

21311112323 is a wasteful number, since it uses less digits than its factorization.

21311112323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360225.

The product of its digits is 216, while the sum is 20.

Adding to 21311112323 its reverse (32321111312), we get a palindrome (53632223635).

The spelling of 21311112323 in words is "twenty-one billion, three hundred eleven million, one hundred twelve thousand, three hundred twenty-three".