12111111010111 has 4 divisors (see below), whose sum is σ = 12748537905400. Its totient is φ = 11473684114824.

The previous prime is 12111111010049. The next prime is 12111111010123. The reversal of 12111111010111 is 11101011111121.

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 12111111010111 - 2²³ = 12111102621503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111111010091 and 12111111010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111111010151) 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, 318713447616 + ... + 318713447653.

It is an arithmetic number, because the mean of its divisors is an integer number (3187134476350).

Almost surely, 2^{12111111010111} is an apocalyptic number.

12111111010111 is a deficient number, since it is larger than the sum of its proper divisors (637426895289).

12111111010111 is an equidigital number, since it uses as much as digits as its factorization.

12111111010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637426895288.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 12111111010111 its reverse (11101011111121), we get a palindrome (23212122121232).

It can be divided in two parts, 12111111010 and 111, that added together give a palindrome (12111111121).

The spelling of 12111111010111 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, ten thousand, one hundred eleven".