12011212211111 has 8 divisors (see below), whose sum is σ = 12022477633344. Its totient is φ = 11999950813440.

The previous prime is 12011212211029. The next prime is 12011212211191. The reversal of 12011212211111 is 11111221211021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011212211111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12011212211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011212211191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4982306 + ... + 6988976.

It is an arithmetic number, because the mean of its divisors is an integer number (1502809704168).

Almost surely, 2^{12011212211111} is an apocalyptic number.

12011212211111 is a deficient number, since it is larger than the sum of its proper divisors (11265422233).

12011212211111 is a wasteful number, since it uses less digits than its factorization.

12011212211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012281.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12011212211111 its reverse (11111221211021), we get a palindrome (23122433422132).

The spelling of 12011212211111 in words is "twelve trillion, eleven billion, two hundred twelve million, two hundred eleven thousand, one hundred eleven".