1211221211212 has 6 divisors (see below), whose sum is σ = 2119637119628. Its totient is φ = 605610605604.

The previous prime is 1211221211183. The next prime is 1211221211237. The reversal of 1211221211212 is 2121121221121.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1211221211212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151402651398 + ... + 151402651405.

Almost surely, 2^{1211221211212} is an apocalyptic number.

It is an amenable number.

1211221211212 is a deficient number, since it is larger than the sum of its proper divisors (908415908416).

1211221211212 is a wasteful number, since it uses less digits than its factorization.

1211221211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302805302807 (or 302805302805 counting only the distinct ones).

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

Adding to 1211221211212 its reverse (2121121221121), we get a palindrome (3332342432333).

Subtracting 1211221211212 from its reverse (2121121221121), we obtain a palindrome (909900009909).

The spelling of 1211221211212 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twelve".