12222443221 has 4 divisors (see below), whose sum is σ = 12222686700. Its totient is φ = 12222199744.

The previous prime is 12222443171. The next prime is 12222443227. The reversal of 12222443221 is 12234422221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11721310225 + 501132996 = 108265^2 + 22386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12222443221 - 2¹⁷ = 12222312149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222443227) 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, 15586 + ... + 157123.

It is an arithmetic number, because the mean of its divisors is an integer number (3055671675).

Almost surely, 2^12222443221 is an apocalyptic number.

It is an amenable number.

12222443221 is a deficient number, since it is larger than the sum of its proper divisors (243479).

12222443221 is an equidigital number, since it uses as much as digits as its factorization.

12222443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243478.

The product of its digits is 3072, while the sum is 25.

Adding to 12222443221 its reverse (12234422221), we get a palindrome (24456865442).

The spelling of 12222443221 in words is "twelve billion, two hundred twenty-two million, four hundred forty-three thousand, two hundred twenty-one".