12221123221 has 4 divisors (see below), whose sum is σ = 12221345344. Its totient is φ = 12220901100.

The previous prime is 12221123219. The next prime is 12221123261. The reversal of 12221123221 is 12232112221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12221123221 - 2¹ = 12221123219 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 (12221123261) 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, 39556 + ... + 161266.

It is an arithmetic number, because the mean of its divisors is an integer number (3055336336).

Almost surely, 2^12221123221 is an apocalyptic number.

It is an amenable number.

12221123221 is a deficient number, since it is larger than the sum of its proper divisors (222123).

12221123221 is a wasteful number, since it uses less digits than its factorization.

12221123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222122.

The product of its digits is 192, while the sum is 19.

Adding to 12221123221 its reverse (12232112221), we get a palindrome (24453235442).

The spelling of 12221123221 in words is "twelve billion, two hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".