12120311111 has 4 divisors (see below), whose sum is σ = 12200578224. Its totient is φ = 12040044000.

The previous prime is 12120311101. The next prime is 12120311123. The reversal of 12120311111 is 11111302121.

12120311111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11111302121 = 29 ⋅383148349.

It is a cyclic number.

It is not a de Polignac number, because 12120311111 - 2¹⁴ = 12120294727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120311101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40133330 + ... + 40133631.

It is an arithmetic number, because the mean of its divisors is an integer number (3050144556).

Almost surely, 2^12120311111 is an apocalyptic number.

12120311111 is a deficient number, since it is larger than the sum of its proper divisors (80267113).

12120311111 is an equidigital number, since it uses as much as digits as its factorization.

12120311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80267112.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 12120311111 its reverse (11111302121), we get a palindrome (23231613232).

The spelling of 12120311111 in words is "twelve billion, one hundred twenty million, three hundred eleven thousand, one hundred eleven".