212111211222211 has 4 divisors (see below), whose sum is σ = 242412812825392. Its totient is φ = 181809609619032.

The previous prime is 212111211222203. The next prime is 212111211222221. The reversal of 212111211222211 is 112222112111212.

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 212111211222211 - 2³ = 212111211222203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212111211222221) 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, 15150800801580 + ... + 15150800801593.

It is an arithmetic number, because the mean of its divisors is an integer number (60603203206348).

Almost surely, 2^{212111211222211} is an apocalyptic number.

212111211222211 is a deficient number, since it is larger than the sum of its proper divisors (30301601603181).

212111211222211 is an equidigital number, since it uses as much as digits as its factorization.

212111211222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30301601603180.

The product of its digits is 128, while the sum is 22.

Adding to 212111211222211 its reverse (112222112111212), we get a palindrome (324333323333423).

The spelling of 212111211222211 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, two hundred eleven".