12121211112 has 16 divisors (see below), whose sum is σ = 30303027840. Its totient is φ = 4040403696.

The previous prime is 12121211111. The next prime is 12121211131. The reversal of 12121211112 is 21111212121.

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 = 12121211091 and 12121211100.

It is not an unprimeable number, because it can be changed into a prime (12121211111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252525208 + ... + 252525255.

It is an arithmetic number, because the mean of its divisors is an integer number (1893939240).

Almost surely, 2^12121211112 is an apocalyptic number.

12121211112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121211112 is an abundant number, since it is smaller than the sum of its proper divisors (18181816728).

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

12121211112 is a wasteful number, since it uses less digits than its factorization.

12121211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505050472 (or 505050468 counting only the distinct ones).

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

Adding to 12121211112 its reverse (21111212121), we get a palindrome (33232423233).

It can be divided in two parts, 12121 and 211112, that multiplied together give a palindrome (2558888552).

The spelling of 12121211112 in words is "twelve billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twelve".