12111211112111 has 8 divisors (see below), whose sum is σ = 12134893357440. Its totient is φ = 12087546265432.

The previous prime is 12111211112083. The next prime is 12111211112123. The reversal of 12111211112111 is 11121111211121.

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 12111211112111 - 2⁶ = 12111211112047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111211112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111211112131) 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, 2955665 + ... + 5740938.

It is an arithmetic number, because the mean of its divisors is an integer number (1516861669680).

Almost surely, 2^{12111211112111} is an apocalyptic number.

12111211112111 is a deficient number, since it is larger than the sum of its proper divisors (23682245329).

12111211112111 is an equidigital number, since it uses as much as digits as its factorization.

12111211112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8699325.

The product of its digits is 8, while the sum is 17.

Adding to 12111211112111 its reverse (11121111211121), we get a palindrome (23232322323232).

It can be divided in two parts, 1211121 and 1112111, that added together give a palindrome (2323232).

The spelling of 12111211112111 in words is "twelve trillion, one hundred eleven billion, two hundred eleven million, one hundred twelve thousand, one hundred eleven".