12111231023 has 4 divisors (see below), whose sum is σ = 12112498440. Its totient is φ = 12109963608.

The previous prime is 12111231017. The next prime is 12111231037. The reversal of 12111231023 is 32013211121.

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 12111231023 - 2¹⁶ = 12111165487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111230992 and 12111231010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111231323) 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, 619265 + ... + 638522.

It is an arithmetic number, because the mean of its divisors is an integer number (3028124610).

Almost surely, 2^12111231023 is an apocalyptic number.

12111231023 is a deficient number, since it is larger than the sum of its proper divisors (1267417).

12111231023 is an equidigital number, since it uses as much as digits as its factorization.

12111231023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267416.

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

Adding to 12111231023 its reverse (32013211121), we get a palindrome (44124442144).

The spelling of 12111231023 in words is "twelve billion, one hundred eleven million, two hundred thirty-one thousand, twenty-three".