212212211 has 4 divisors (see below), whose sum is σ = 214313424. Its totient is φ = 210111000.

The previous prime is 212212201. The next prime is 212212213. The reversal of 212212211 is 112212212.

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 212212211 - 2¹⁴ = 212195827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212212213) 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, 1050455 + ... + 1050656.

It is an arithmetic number, because the mean of its divisors is an integer number (53578356).

Almost surely, 2^212212211 is an apocalyptic number.

212212211 is a deficient number, since it is larger than the sum of its proper divisors (2101213).

212212211 is a wasteful number, since it uses less digits than its factorization.

212212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101212.

The product of its digits is 32, while the sum is 14.

The square root of 212212211 is about 14567.5053114801. The cubic root of 212212211 is about 596.4720849789.

Adding to 212212211 its reverse (112212212), we get a palindrome (324424423).

Subtracting from 212212211 its reverse (112212212), we obtain a palindrome (99999999).

It can be divided in two parts, 21221 and 2211, that added together give a palindrome (23432).

The spelling of 212212211 in words is "two hundred twelve million, two hundred twelve thousand, two hundred eleven".