12031023111 has 4 divisors (see below), whose sum is σ = 16041364152. Its totient is φ = 8020682072.

The previous prime is 12031023083. The next prime is 12031023133. The reversal of 12031023111 is 11132013021.

It is a happy number.

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 12031023111 - 2¹⁸ = 12030760967 is a prime.

It is a super-2 number, since 2×12031023111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031023311) 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, 2005170516 + ... + 2005170521.

It is an arithmetic number, because the mean of its divisors is an integer number (4010341038).

Almost surely, 2^12031023111 is an apocalyptic number.

12031023111 is a deficient number, since it is larger than the sum of its proper divisors (4010341041).

12031023111 is an equidigital number, since it uses as much as digits as its factorization.

12031023111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010341040.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12031023111 its reverse (11132013021), we get a palindrome (23163036132).

The spelling of 12031023111 in words is "twelve billion, thirty-one million, twenty-three thousand, one hundred eleven".