12211111212111 has 24 divisors (see below), whose sum is σ = 20159780603040. Its totient is φ = 6977170077696.

The previous prime is 12211111212107. The next prime is 12211111212211. The reversal of 12211111212111 is 11121211111221.

12211111212111 is a `hidden beast` number, since 1 + 221 + 111 + 121 + 211 + 1 = 666.

It is not a de Polignac number, because 12211111212111 - 2² = 12211111212107 is a prime.

It is a super-2 number, since 2×12211111212111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211111212011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7711530 + ... + 9159143.

It is an arithmetic number, because the mean of its divisors is an integer number (839990858460).

Almost surely, 2^{12211111212111} is an apocalyptic number.

12211111212111 is a deficient number, since it is larger than the sum of its proper divisors (7948669390929).

12211111212111 is a wasteful number, since it uses less digits than its factorization.

12211111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16882175 (or 16882172 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12211111212111 its reverse (11121211111221), we get a palindrome (23332322323332).

The spelling of 12211111212111 in words is "twelve trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".