12221323312 has 30 divisors (see below), whose sum is σ = 26027130164. Its totient is φ = 5555146080.

The previous prime is 12221323267. The next prime is 12221323319. The reversal of 12221323312 is 21332312221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (12221323319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3154398 + ... + 3158269.

Almost surely, 2^12221323312 is an apocalyptic number.

It is an amenable number.

12221323312 is an abundant number, since it is smaller than the sum of its proper divisors (13805806852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221323312 is a wasteful number, since it uses less digits than its factorization.

12221323312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312697 (or 6312680 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 12221323312 its reverse (21332312221), we get a palindrome (33553635533).

It can be divided in two parts, 12221 and 323312, that added together give a palindrome (335533).

The spelling of 12221323312 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-three thousand, three hundred twelve".