212211221111 has 4 divisors (see below), whose sum is σ = 217146365832. Its totient is φ = 207276076392.

The previous prime is 212211221107. The next prime is 212211221129. The reversal of 212211221111 is 111122112212.

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 212211221111 - 2² = 212211221107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212211221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211221611) 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, 2467572296 + ... + 2467572381.

It is an arithmetic number, because the mean of its divisors is an integer number (54286591458).

Almost surely, 2^212211221111 is an apocalyptic number.

212211221111 is a deficient number, since it is larger than the sum of its proper divisors (4935144721).

212211221111 is an equidigital number, since it uses as much as digits as its factorization.

212211221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935144720.

The product of its digits is 32, while the sum is 17.

Adding to 212211221111 its reverse (111122112212), we get a palindrome (323333333323).

The spelling of 212211221111 in words is "two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".