12122321111 has 4 divisors (see below), whose sum is σ = 12122562192. Its totient is φ = 12122080032.

The previous prime is 12122321041. The next prime is 12122321153. The reversal of 12122321111 is 11112322121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112322121 = 19 ⋅584859059.

It is a cyclic number.

It is not a de Polignac number, because 12122321111 - 2²² = 12118126807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12122321111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122321161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13331 + ... + 156276.

It is an arithmetic number, because the mean of its divisors is an integer number (3030640548).

Almost surely, 2^12122321111 is an apocalyptic number.

12122321111 is a deficient number, since it is larger than the sum of its proper divisors (241081).

12122321111 is an equidigital number, since it uses as much as digits as its factorization.

12122321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241080.

The product of its digits is 48, while the sum is 17.

Adding to 12122321111 its reverse (11112322121), we get a palindrome (23234643232).

The spelling of 12122321111 in words is "twelve billion, one hundred twenty-two million, three hundred twenty-one thousand, one hundred eleven".