12012111212111 has 16 divisors (see below), whose sum is σ = 12884277266784. Its totient is φ = 11158966923264.

The previous prime is 12012111212071. The next prime is 12012111212119. The reversal of 12012111212111 is 11121211121021.

It is a cyclic number.

It is not a de Polignac number, because 12012111212111 - 2⁶ = 12012111212047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 12012111212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012111212119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9149645 + ... + 10379798.

It is an arithmetic number, because the mean of its divisors is an integer number (805267329174).

Almost surely, 2^{12012111212111} is an apocalyptic number.

12012111212111 is a deficient number, since it is larger than the sum of its proper divisors (872166054673).

12012111212111 is a wasteful number, since it uses less digits than its factorization.

12012111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19529930.

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

Adding to 12012111212111 its reverse (11121211121021), we get a palindrome (23133322333132).

The spelling of 12012111212111 in words is "twelve trillion, twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".