12121212111212 has 24 divisors (see below), whose sum is σ = 21450879626400. Its totient is φ = 5992392027776.

The previous prime is 12121212111167. The next prime is 12121212111289. The reversal of 12121212111212 is 21211121212121.

It is a happy number.

It is a super-2 number, since 2×12121212111212² (a number of 27 digits) contains 22 as substring.

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

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, 19535489 + ... + 20146407.

It is an arithmetic number, because the mean of its divisors is an integer number (893786651100).

Almost surely, 2^{12121212111212} is an apocalyptic number.

It is an amenable number.

12121212111212 is a deficient number, since it is larger than the sum of its proper divisors (9329667515188).

12121212111212 is a wasteful number, since it uses less digits than its factorization.

12121212111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666745 (or 666743 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 12121212111212 its reverse (21211121212121), we get a palindrome (33332333323333).

The spelling of 12121212111212 in words is "twelve trillion, one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, two hundred twelve".