12212120312 has 32 divisors (see below), whose sum is σ = 26175484800. Its totient is φ = 5232434784.

The previous prime is 12212120281. The next prime is 12212120317. The reversal of 12212120312 is 21302121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212120317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212903 + ... + 264105.

It is an arithmetic number, because the mean of its divisors is an integer number (817983900).

Almost surely, 2^12212120312 is an apocalyptic number.

It is an amenable number.

12212120312 is an abundant number, since it is smaller than the sum of its proper divisors (13963364488).

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

12212120312 is a wasteful number, since it uses less digits than its factorization.

12212120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55475 (or 55471 counting only the distinct ones).

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

Adding to 12212120312 its reverse (21302121221), we get a palindrome (33514241533).

Subtracting 12212120312 from its reverse (21302121221), we obtain a palindrome (9090000909).

The spelling of 12212120312 in words is "twelve billion, two hundred twelve million, one hundred twenty thousand, three hundred twelve".