22231211221 has 4 divisors (see below), whose sum is σ = 22544326944. Its totient is φ = 21918095500.

The previous prime is 22231211159. The next prime is 22231211227. The reversal of 22231211221 is 12211213222.

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 22231211221 - 2¹¹ = 22231209173 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 (22231211227) 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, 156557755 + ... + 156557896.

It is an arithmetic number, because the mean of its divisors is an integer number (5636081736).

Almost surely, 2^22231211221 is an apocalyptic number.

It is an amenable number.

22231211221 is a deficient number, since it is larger than the sum of its proper divisors (313115723).

22231211221 is an equidigital number, since it uses as much as digits as its factorization.

22231211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313115722.

The product of its digits is 192, while the sum is 19.

Adding to 22231211221 its reverse (12211213222), we get a palindrome (34442424443).

The spelling of 22231211221 in words is "twenty-two billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty-one".