22222422221 has 4 divisors (see below), whose sum is σ = 22222882752. Its totient is φ = 22221961692.

The previous prime is 22222422169. The next prime is 22222422247. The reversal of 22222422221 is 12222422222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22222422221 - 2²² = 22218227917 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 (22222422251) 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, 148115 + ... + 257648.

It is an arithmetic number, because the mean of its divisors is an integer number (5555720688).

Almost surely, 2^22222422221 is an apocalyptic number.

It is an amenable number.

22222422221 is a deficient number, since it is larger than the sum of its proper divisors (460531).

22222422221 is an equidigital number, since it uses as much as digits as its factorization.

22222422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460530.

The product of its digits is 2048, while the sum is 23.

Adding to 22222422221 its reverse (12222422222), we get a palindrome (34444844443).

Subtracting from 22222422221 its reverse (12222422222), we obtain a palindrome (9999999999).

The spelling of 22222422221 in words is "twenty-two billion, two hundred twenty-two million, four hundred twenty-two thousand, two hundred twenty-one".