12221331312 has 20 divisors (see below), whose sum is σ = 31571772680. Its totient is φ = 4073777088.

The previous prime is 12221331271. The next prime is 12221331341. The reversal of 12221331312 is 21313312221.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127305487 + ... + 127305582.

It is an arithmetic number, because the mean of its divisors is an integer number (1578588634).

Almost surely, 2^12221331312 is an apocalyptic number.

12221331312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221331312 is an abundant number, since it is smaller than the sum of its proper divisors (19350441368).

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

12221331312 is a wasteful number, since it uses less digits than its factorization.

12221331312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254611080 (or 254611074 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 12221331312 its reverse (21313312221), we get a palindrome (33534643533).

The spelling of 12221331312 in words is "twelve billion, two hundred twenty-one million, three hundred thirty-one thousand, three hundred twelve".