12213121312 has 48 divisors (see below), whose sum is σ = 27633130560. Its totient is φ = 5204936448.

The previous prime is 12213121267. The next prime is 12213121313. The reversal of 12213121312 is 21312131221.

It is a self number, because there is not a number n which added to its sum of digits gives 12213121312.

It is not an unprimeable number, because it can be changed into a prime (12213121313) 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, 112203 + ... + 192394.

It is an arithmetic number, because the mean of its divisors is an integer number (575690220).

Almost surely, 2^12213121312 is an apocalyptic number.

It is an amenable number.

12213121312 is an abundant number, since it is smaller than the sum of its proper divisors (15420009248).

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

12213121312 is a wasteful number, since it uses less digits than its factorization.

12213121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304793 (or 304785 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 12213121312 its reverse (21312131221), we get a palindrome (33525252533).

Subtracting 12213121312 from its reverse (21312131221), we obtain a palindrome (9099009909).

The spelling of 12213121312 in words is "twelve billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred twelve".