221223211111 has 4 divisors (see below), whose sum is σ = 252826526992. Its totient is φ = 189619895232.

The previous prime is 221223211087. The next prime is 221223211133. The reversal of 221223211111 is 111112322122.

221223211111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111112322122 = 2 ⋅55556161061.

It is a cyclic number.

It is not a de Polignac number, because 221223211111 - 2⁹ = 221223210599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223211711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15801657930 + ... + 15801657943.

It is an arithmetic number, because the mean of its divisors is an integer number (63206631748).

Almost surely, 2^221223211111 is an apocalyptic number.

221223211111 is a deficient number, since it is larger than the sum of its proper divisors (31603315881).

221223211111 is an equidigital number, since it uses as much as digits as its factorization.

221223211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31603315880.

The product of its digits is 96, while the sum is 19.

Adding to 221223211111 its reverse (111112322122), we get a palindrome (332335533233).

The spelling of 221223211111 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred eleven thousand, one hundred eleven".