12111021111 has 16 divisors (see below), whose sum is σ = 18677240064. Its totient is φ = 6837201984.

The previous prime is 12111021089. The next prime is 12111021113. The reversal of 12111021111 is 11112011121.

It is not a de Polignac number, because 12111021111 - 2⁶ = 12111021047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111021113) 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 15 ways as a sum of consecutive naturals, for example, 3472446 + ... + 3475931.

It is an arithmetic number, because the mean of its divisors is an integer number (1167327504).

Almost surely, 2^12111021111 is an apocalyptic number.

12111021111 is a deficient number, since it is larger than the sum of its proper divisors (6566218953).

12111021111 is an equidigital number, since it uses as much as digits as its factorization.

12111021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948470.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 12111021111 its reverse (11112011121), we get a palindrome (23223032232).

The spelling of 12111021111 in words is "twelve billion, one hundred eleven million, twenty-one thousand, one hundred eleven".