212102221211 has 4 divisors (see below), whose sum is σ = 212592065112. Its totient is φ = 211612377312.

The previous prime is 212102221207. The next prime is 212102221231. The reversal of 212102221211 is 112122201212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212102221211 - 2² = 212102221207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212102221211.

It is not an unprimeable number, because it can be changed into a prime (212102221231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244921301 + ... + 244922166.

It is an arithmetic number, because the mean of its divisors is an integer number (53148016278).

Almost surely, 2^212102221211 is an apocalyptic number.

212102221211 is a deficient number, since it is larger than the sum of its proper divisors (489843901).

212102221211 is an equidigital number, since it uses as much as digits as its factorization.

212102221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489843900.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212102221211 its reverse (112122201212), we get a palindrome (324224422423).

The spelling of 212102221211 in words is "two hundred twelve billion, one hundred two million, two hundred twenty-one thousand, two hundred eleven".