12111112221212 has 12 divisors (see below), whose sum is σ = 21361331792640. Its totient is φ = 6007874566176.

The previous prime is 12111112221181. The next prime is 12111112221223. The reversal of 12111112221212 is 21212221111121.

It is a happy number.

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, 11920385537 + ... + 11920386552.

It is an arithmetic number, because the mean of its divisors is an integer number (1780110982720).

Almost surely, 2^{12111112221212} is an apocalyptic number.

It is an amenable number.

12111112221212 is a deficient number, since it is larger than the sum of its proper divisors (9250219571428).

12111112221212 is a wasteful number, since it uses less digits than its factorization.

12111112221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23840772220 (or 23840772218 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 12111112221212 its reverse (21212221111121), we get a palindrome (33323333332333).

The spelling of 12111112221212 in words is "twelve trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".