201111201221212 has 48 divisors (see below), whose sum is σ = 367841442921120. Its totient is φ = 96085321113600.

The previous prime is 201111201221153. The next prime is 201111201221219. The reversal of 201111201221212 is 212122102111102.

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 201111201221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111201221219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668679787 + ... + 668980477.

It is an arithmetic number, because the mean of its divisors is an integer number (7663363394190).

Almost surely, 2^{201111201221212} is an apocalyptic number.

It is an amenable number.

201111201221212 is a deficient number, since it is larger than the sum of its proper divisors (166730241699908).

201111201221212 is a wasteful number, since it uses less digits than its factorization.

201111201221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360262 (or 360260 counting only the distinct ones).

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

Adding to 201111201221212 its reverse (212122102111102), we get a palindrome (413233303332314).

The spelling of 201111201221212 in words is "two hundred one trillion, one hundred eleven billion, two hundred one million, two hundred twenty-one thousand, two hundred twelve".