12111121212 has 48 divisors (see below), whose sum is σ = 28672890624. Its totient is φ = 3978016000.

The previous prime is 12111121207. The next prime is 12111121223. The reversal of 12111121212 is 21212111121.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12111121191 and 12111121200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2563012 + ... + 2567732.

It is an arithmetic number, because the mean of its divisors is an integer number (597351888).

Almost surely, 2^12111121212 is an apocalyptic number.

12111121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12111121212 is an abundant number, since it is smaller than the sum of its proper divisors (16561769412).

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

12111121212 is a wasteful number, since it uses less digits than its factorization.

12111121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7810 (or 7808 counting only the distinct ones).

The product of its digits is 16, while the sum is 15.

Adding to 12111121212 its reverse (21212111121), we get a palindrome (33323232333).

It can be divided in two parts, 12111121 and 212, that multiplied together give a palindrome (2567557652).

The spelling of 12111121212 in words is "twelve billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twelve".