12211212212111 has 6 divisors (see below), whose sum is σ = 13422241522536. Its totient is φ = 11101102010900.

The previous prime is 12211212212099. The next prime is 12211212212201. The reversal of 12211212212111 is 11121221211221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12211212212111 is a prime.

It is a super-2 number, since 2×12211212212111² (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 (12211212212711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50459554475 + ... + 50459554716.

It is an arithmetic number, because the mean of its divisors is an integer number (2237040253756).

Almost surely, 2^{12211212212111} is an apocalyptic number.

12211212212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12211212212111 is a deficient number, since it is larger than the sum of its proper divisors (1211029310425).

12211212212111 is a wasteful number, since it uses less digits than its factorization.

12211212212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100919109213 (or 100919109202 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 12211212212111 its reverse (11121221211221), we get a palindrome (23332433423332).

The spelling of 12211212212111 in words is "twelve trillion, two hundred eleven billion, two hundred twelve million, two hundred twelve thousand, one hundred eleven".