12111222221212 has 24 divisors (see below), whose sum is σ = 21711836804112. Its totient is φ = 5907843753600.

The previous prime is 12111222221201. The next prime is 12111222221257. The reversal of 12111222221212 is 21212222211121.

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 7 ways as a sum of consecutive naturals, for example, 15268803 + ... + 16042405.

It is an arithmetic number, because the mean of its divisors is an integer number (904659866838).

Almost surely, 2^{12111222221212} is an apocalyptic number.

It is an amenable number.

12111222221212 is a deficient number, since it is larger than the sum of its proper divisors (9600614582900).

12111222221212 is a wasteful number, since it uses less digits than its factorization.

12111222221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869109 (or 869107 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 12111222221212 its reverse (21212222211121), we get a palindrome (33323444432333).

The spelling of 12111222221212 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twelve".