12211121111 has 4 divisors (see below), whose sum is σ = 13955566992. Its totient is φ = 10466675232.

The previous prime is 12211121099. The next prime is 12211121129. The reversal of 12211121111 is 11112111221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211121111 is a prime.

It is a super-2 number, since 2×12211121111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211121161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872222930 + ... + 872222943.

It is an arithmetic number, because the mean of its divisors is an integer number (3488891748).

Almost surely, 2^12211121111 is an apocalyptic number.

12211121111 is a deficient number, since it is larger than the sum of its proper divisors (1744445881).

12211121111 is an equidigital number, since it uses as much as digits as its factorization.

12211121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744445880.

The product of its digits is 8, while the sum is 14.

Adding to 12211121111 its reverse (11112111221), we get a palindrome (23323232332).

The spelling of 12211121111 in words is "twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred eleven".