11211201221212 has 24 divisors (see below), whose sum is σ = 20037789688896. Its totient is φ = 5486127372288.

The previous prime is 11211201221197. The next prime is 11211201221219. The reversal of 11211201221212 is 21212210211211.

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 11211201221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211201221219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3988368 + ... + 6191080.

It is an arithmetic number, because the mean of its divisors is an integer number (834907903704).

Almost surely, 2^{11211201221212} is an apocalyptic number.

It is an amenable number.

11211201221212 is a deficient number, since it is larger than the sum of its proper divisors (8826588467684).

11211201221212 is a wasteful number, since it uses less digits than its factorization.

11211201221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229837 (or 2229835 counting only the distinct ones).

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

Adding to 11211201221212 its reverse (21212210211211), we get a palindrome (32423411432423).

The spelling of 11211201221212 in words is "eleven trillion, two hundred eleven billion, two hundred one million, two hundred twenty-one thousand, two hundred twelve".