12111022111 has 12 divisors (see below), whose sum is σ = 12409478208. Its totient is φ = 11819590944.

The previous prime is 12111022069. The next prime is 12111022127. The reversal of 12111022111 is 11122011121.

It is a happy number.

It is not a de Polignac number, because 12111022111 - 2⁷ = 12111021983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111022091 and 12111022100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111022171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3368931 + ... + 3372523.

It is an arithmetic number, because the mean of its divisors is an integer number (1034123184).

Almost surely, 2^12111022111 is an apocalyptic number.

12111022111 is a deficient number, since it is larger than the sum of its proper divisors (298456097).

12111022111 is an equidigital number, since it uses as much as digits as its factorization.

12111022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502 (or 5459 counting only the distinct ones).

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

Adding to 12111022111 its reverse (11122011121), we get a palindrome (23233033232).

The spelling of 12111022111 in words is "twelve billion, one hundred eleven million, twenty-two thousand, one hundred eleven".