212212221211211 has 4 divisors (see below), whose sum is σ = 228536238227472. Its totient is φ = 195888204194952.

The previous prime is 212212221211183. The next prime is 212212221211229. The reversal of 212212221211211 is 112112122212212.

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 212212221211211 - 2¹⁸ = 212212220949067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212212221211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8162008508111 + ... + 8162008508136.

It is an arithmetic number, because the mean of its divisors is an integer number (57134059556868).

Almost surely, 2^{212212221211211} is an apocalyptic number.

212212221211211 is a deficient number, since it is larger than the sum of its proper divisors (16324017016261).

212212221211211 is a wasteful number, since it uses less digits than its factorization.

212212221211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16324017016260.

The product of its digits is 256, while the sum is 23.

Adding to 212212221211211 its reverse (112112122212212), we get a palindrome (324324343423423).

The spelling of 212212221211211 in words is "two hundred twelve trillion, two hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, two hundred eleven".