12012112111 has 4 divisors (see below), whose sum is σ = 12043475712. Its totient is φ = 11980748512.

The previous prime is 12012112087. The next prime is 12012112117. The reversal of 12012112111 is 11121121021.

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 12012112111 - 2⁷ = 12012111983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012112091 and 12012112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012112117) 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, 15681226 + ... + 15681991.

It is an arithmetic number, because the mean of its divisors is an integer number (3010868928).

Almost surely, 2^12012112111 is an apocalyptic number.

12012112111 is a deficient number, since it is larger than the sum of its proper divisors (31363601).

12012112111 is an equidigital number, since it uses as much as digits as its factorization.

12012112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31363600.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12012112111 its reverse (11121121021), we get a palindrome (23133233132).

The spelling of 12012112111 in words is "twelve billion, twelve million, one hundred twelve thousand, one hundred eleven".