13221444312 has 24 divisors (see below), whose sum is σ = 35808078540. Its totient is φ = 4407148080.

The previous prime is 13221444287. The next prime is 13221444319. The reversal of 13221444312 is 21344412231.

13221444312 is a `hidden beast` number, since 1 + 3 + 2 + 214 + 443 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221444319) 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, 91815514 + ... + 91815657.

Almost surely, 2^13221444312 is an apocalyptic number.

13221444312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13221444312 is an abundant number, since it is smaller than the sum of its proper divisors (22586634228).

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

13221444312 is a wasteful number, since it uses less digits than its factorization.

13221444312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183631183 (or 183631176 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 13221444312 its reverse (21344412231), we get a palindrome (34565856543).

The spelling of 13221444312 in words is "thirteen billion, two hundred twenty-one million, four hundred forty-four thousand, three hundred twelve".