12221213321 has 4 divisors (see below), whose sum is σ = 12642634500. Its totient is φ = 11799792144.

The previous prime is 12221213219. The next prime is 12221213339. The reversal of 12221213321 is 12331212221.

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 8541456400 + 3679756921 = 92420^2 + 60661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221213321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221213293 and 12221213302.

It is not an unprimeable number, because it can be changed into a prime (12221213821) 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, 210710546 + ... + 210710603.

It is an arithmetic number, because the mean of its divisors is an integer number (3160658625).

Almost surely, 2^12221213321 is an apocalyptic number.

It is an amenable number.

12221213321 is a deficient number, since it is larger than the sum of its proper divisors (421421179).

12221213321 is an equidigital number, since it uses as much as digits as its factorization.

12221213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421421178.

The product of its digits is 288, while the sum is 20.

Adding to 12221213321 its reverse (12331212221), we get a palindrome (24552425542).

The spelling of 12221213321 in words is "twelve billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-one".