12122111321 has 4 divisors (see below), whose sum is σ = 12760117200. Its totient is φ = 11484105444.

The previous prime is 12122111317. The next prime is 12122111327. The reversal of 12122111321 is 12311122121.

It is a happy number.

12122111321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12122111321 - 2² = 12122111317 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 12122111321.

It is not an unprimeable number, because it can be changed into a prime (12122111327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319002911 + ... + 319002948.

It is an arithmetic number, because the mean of its divisors is an integer number (3190029300).

Almost surely, 2^12122111321 is an apocalyptic number.

It is an amenable number.

12122111321 is a deficient number, since it is larger than the sum of its proper divisors (638005879).

12122111321 is an equidigital number, since it uses as much as digits as its factorization.

12122111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638005878.

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

Adding to 12122111321 its reverse (12311122121), we get a palindrome (24433233442).

The spelling of 12122111321 in words is "twelve billion, one hundred twenty-two million, one hundred eleven thousand, three hundred twenty-one".