12211111121111 has 16 divisors (see below), whose sum is σ = 14785900609536. Its totient is φ = 9844693727616.

The previous prime is 12211111121107. The next prime is 12211111121117. The reversal of 12211111121111 is 11112111111221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12211111121111 - 2² = 12211111121107 is a prime.

It is a super-2 number, since 2×12211111121111² (a number of 27 digits) contains 22 as substring.

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 12211111121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211111121117) 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, 32555831 + ... + 32928776.

It is an arithmetic number, because the mean of its divisors is an integer number (924118788096).

Almost surely, 2^{12211111121111} is an apocalyptic number.

12211111121111 is a deficient number, since it is larger than the sum of its proper divisors (2574789488425).

12211111121111 is a wasteful number, since it uses less digits than its factorization.

12211111121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65486198.

The product of its digits is 8, while the sum is 17.

Adding to 12211111121111 its reverse (11112111111221), we get a palindrome (23323222232332).

The spelling of 12211111121111 in words is "twelve trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".