12121212212 has 24 divisors (see below), whose sum is σ = 21366487296. Its totient is φ = 6016637088.

The previous prime is 12121212209. The next prime is 12121212223. The reversal of 12121212212 is 21221212121.

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, 348233 + ... + 381455.

It is an arithmetic number, because the mean of its divisors is an integer number (890270304).

Almost surely, 2^12121212212 is an apocalyptic number.

It is an amenable number.

12121212212 is a deficient number, since it is larger than the sum of its proper divisors (9245275084).

12121212212 is a wasteful number, since it uses less digits than its factorization.

12121212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33887 (or 33885 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

Adding to 12121212212 its reverse (21221212121), we get a palindrome (33342424333).

Subtracting 12121212212 from its reverse (21221212121), we obtain a palindrome (9099999909).

The spelling of 12121212212 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twelve".