12111320231 has 4 divisors (see below), whose sum is σ = 12124191864. Its totient is φ = 12098448600.

The previous prime is 12111320227. The next prime is 12111320237. The reversal of 12111320231 is 13202311121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12111320231 - 2² = 12111320227 is a prime.

It is a super-2 number, since 2×12111320231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111320237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6434405 + ... + 6436286.

It is an arithmetic number, because the mean of its divisors is an integer number (3031047966).

Almost surely, 2^12111320231 is an apocalyptic number.

12111320231 is a deficient number, since it is larger than the sum of its proper divisors (12871633).

12111320231 is an equidigital number, since it uses as much as digits as its factorization.

12111320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12871632.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12111320231 its reverse (13202311121), we get a palindrome (25313631352).

The spelling of 12111320231 in words is "twelve billion, one hundred eleven million, three hundred twenty thousand, two hundred thirty-one".