22221220111 has 4 divisors (see below), whose sum is σ = 22221533952. Its totient is φ = 22220906272.

The previous prime is 22221220079. The next prime is 22221220213. The reversal of 22221220111 is 11102212222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22221220111 - 2⁵ = 22221220079 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 (22221220711) 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, 4935 + ... + 210871.

It is an arithmetic number, because the mean of its divisors is an integer number (5555383488).

Almost surely, 2^22221220111 is an apocalyptic number.

22221220111 is a deficient number, since it is larger than the sum of its proper divisors (313841).

22221220111 is a wasteful number, since it uses less digits than its factorization.

22221220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313840.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22221220111 its reverse (11102212222), we get a palindrome (33323432333).

The spelling of 22221220111 in words is "twenty-two billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".