12011221211212 has 24 divisors (see below), whose sum is σ = 21241233934704. Its totient is φ = 5942325798912.

The previous prime is 12011221211191. The next prime is 12011221211221. The reversal of 12011221211212 is 21211212211021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12011221211212.

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, 1886158 + ... + 5251669.

It is an arithmetic number, because the mean of its divisors is an integer number (885051413946).

Almost surely, 2^{12011221211212} is an apocalyptic number.

It is an amenable number.

12011221211212 is a deficient number, since it is larger than the sum of its proper divisors (9230012723492).

12011221211212 is a wasteful number, since it uses less digits than its factorization.

12011221211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142265 (or 7142263 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12011221211212 its reverse (21211212211021), we get a palindrome (33222433422233).

The spelling of 12011221211212 in words is "twelve trillion, eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twelve".