221221112111 has 4 divisors (see below), whose sum is σ = 221331780000. Its totient is φ = 221110444224.

The previous prime is 221221112107. The next prime is 221221112137. The reversal of 221221112111 is 111211122122.

221221112111 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.

It is a cyclic number.

It is not a de Polignac number, because 221221112111 - 2² = 221221112107 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 221221112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221112191) 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, 55330946 + ... + 55334943.

It is an arithmetic number, because the mean of its divisors is an integer number (55332945000).

Almost surely, 2^221221112111 is an apocalyptic number.

221221112111 is a deficient number, since it is larger than the sum of its proper divisors (110667889).

221221112111 is a wasteful number, since it uses less digits than its factorization.

221221112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110667888.

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

Adding to 221221112111 its reverse (111211122122), we get a palindrome (332432234233).

The spelling of 221221112111 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eleven".