212122221211 has 4 divisors (see below), whose sum is σ = 213348361392. Its totient is φ = 210896081032.

The previous prime is 212122221193. The next prime is 212122221221. The reversal of 212122221211 is 112122221212.

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 212122221211 - 2¹⁹ = 212121696923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212122221221) 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, 613069831 + ... + 613070176.

It is an arithmetic number, because the mean of its divisors is an integer number (53337090348).

Almost surely, 2^212122221211 is an apocalyptic number.

212122221211 is a deficient number, since it is larger than the sum of its proper divisors (1226140181).

212122221211 is a wasteful number, since it uses less digits than its factorization.

212122221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226140180.

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

Adding to 212122221211 its reverse (112122221212), we get a palindrome (324244442423).

Subtracting from 212122221211 its reverse (112122221212), we obtain a palindrome (99999999999).

The spelling of 212122221211 in words is "two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".