12121111212 has 48 divisors (see below), whose sum is σ = 32348289792. Its totient is φ = 3460461120.

The previous prime is 12121111207. The next prime is 12121111243. The reversal of 12121111212 is 21211112121.

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 = 12121111191 and 12121111200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52558 + ... + 164330.

It is an arithmetic number, because the mean of its divisors is an integer number (673922704).

Almost surely, 2^12121111212 is an apocalyptic number.

12121111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121111212 is an abundant number, since it is smaller than the sum of its proper divisors (20227178580).

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

12121111212 is a wasteful number, since it uses less digits than its factorization.

12121111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113078 (or 113076 counting only the distinct ones).

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

Adding to 12121111212 its reverse (21211112121), we get a palindrome (33332223333).

Subtracting 12121111212 from its reverse (21211112121), we obtain a palindrome (9090000909).

The spelling of 12121111212 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".