22221212223 has 12 divisors (see below), whose sum is σ = 34465553880. Its totient is φ = 12697835472.

The previous prime is 22221212201. The next prime is 22221212231. The reversal of 22221212223 is 32221212222.

It is not a de Polignac number, because 22221212223 - 2⁸ = 22221211967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 22221212223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221212243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75582208 + ... + 75582501.

It is an arithmetic number, because the mean of its divisors is an integer number (2872129490).

Almost surely, 2^22221212223 is an apocalyptic number.

22221212223 is a deficient number, since it is larger than the sum of its proper divisors (12244341657).

22221212223 is a wasteful number, since it uses less digits than its factorization.

22221212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151164726 (or 151164719 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

Adding to 22221212223 its reverse (32221212222), we get a palindrome (54442424445).

Subtracting 22221212223 from its reverse (32221212222), we obtain a palindrome (9999999999).

The spelling of 22221212223 in words is "twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-three".