12111122111 has 8 divisors (see below), whose sum is σ = 13212960384. Its totient is φ = 11009421720.

The previous prime is 12111122083. The next prime is 12111122117. The reversal of 12111122111 is 11122111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12111122111 - 2³⁰ = 11037380287 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 (12111122117) 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 7 ways as a sum of consecutive naturals, for example, 254726 + ... + 298508.

It is an arithmetic number, because the mean of its divisors is an integer number (1651620048).

Almost surely, 2^12111122111 is an apocalyptic number.

12111122111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12111122111 is a deficient number, since it is larger than the sum of its proper divisors (1101838273).

12111122111 is a wasteful number, since it uses less digits than its factorization.

12111122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68941.

The product of its digits is 8, while the sum is 14.

Adding to 12111122111 its reverse (11122111121), we get a palindrome (23233233232).

It can be divided in two parts, 121 and 11122111, that multiplied together give a palindrome (1345775431).

The spelling of 12111122111 in words is "twelve billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".