12221111321 has 4 divisors (see below), whose sum is σ = 12317340672. Its totient is φ = 12124881972.

The previous prime is 12221111293. The next prime is 12221111347. The reversal of 12221111321 is 12311112221.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-12221111321 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 12221111321.

It is not an unprimeable number, because it can be changed into a prime (12221111921) 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, 48114485 + ... + 48114738.

It is an arithmetic number, because the mean of its divisors is an integer number (3079335168).

Almost surely, 2^12221111321 is an apocalyptic number.

It is an amenable number.

12221111321 is a deficient number, since it is larger than the sum of its proper divisors (96229351).

12221111321 is an equidigital number, since it uses as much as digits as its factorization.

12221111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96229350.

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

Adding to 12221111321 its reverse (12311112221), we get a palindrome (24532223542).

The spelling of 12221111321 in words is "twelve billion, two hundred twenty-one million, one hundred eleven thousand, three hundred twenty-one".