12102221312 has 80 divisors (see below), whose sum is σ = 24445689840. Its totient is φ = 5985288192.

The previous prime is 12102221279. The next prime is 12102221359. The reversal of 12102221312 is 21312220121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27318563 + ... + 27319005.

It is an arithmetic number, because the mean of its divisors is an integer number (305571123).

Almost surely, 2^12102221312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12102221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12222844920).

12102221312 is an abundant number, since it is smaller than the sum of its proper divisors (12343468528).

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

12102221312 is an equidigital number, since it uses as much as digits as its factorization.

12102221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12102221312 its reverse (21312220121), we get a palindrome (33414441433).

The spelling of 12102221312 in words is "twelve billion, one hundred two million, two hundred twenty-one thousand, three hundred twelve".