1211202221212 has 6 divisors (see below), whose sum is σ = 2119603887128. Its totient is φ = 605601110604.

The previous prime is 1211202221209. The next prime is 1211202221219. The reversal of 1211202221212 is 2121222021121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211202221212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202221219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151400277648 + ... + 151400277655.

Almost surely, 2^{1211202221212} is an apocalyptic number.

It is an amenable number.

1211202221212 is a deficient number, since it is larger than the sum of its proper divisors (908401665916).

1211202221212 is a wasteful number, since it uses less digits than its factorization.

1211202221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302800555307 (or 302800555305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1211202221212 its reverse (2121222021121), we get a palindrome (3332424242333).

The spelling of 1211202221212 in words is "one trillion, two hundred eleven billion, two hundred two million, two hundred twenty-one thousand, two hundred twelve".