212122122211 has 4 divisors (see below), whose sum is σ = 212458291024. Its totient is φ = 211785953400.

The previous prime is 212122122151. The next prime is 212122122227. The reversal of 212122122211 is 112221221212.

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 212122122211 - 2¹⁷ = 212121991139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212122122271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168083460 + ... + 168084721.

It is an arithmetic number, because the mean of its divisors is an integer number (53114572756).

Almost surely, 2^212122122211 is an apocalyptic number.

212122122211 is a deficient number, since it is larger than the sum of its proper divisors (336168813).

212122122211 is an equidigital number, since it uses as much as digits as its factorization.

212122122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336168812.

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

Adding to 212122122211 its reverse (112221221212), we get a palindrome (324343343423).

Subtracting from 212122122211 its reverse (112221221212), we obtain a palindrome (99900900999).

The spelling of 212122122211 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".