22222211221 has 4 divisors (see below), whose sum is σ = 25396812832. Its totient is φ = 19047609612.

The previous prime is 22222211203. The next prime is 22222211239. The reversal of 22222211221 is 12211222222.

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 an interprime number because it is at equal distance from previous prime (22222211203) and next prime (22222211239).

It is a cyclic number.

It is not a de Polignac number, because 22222211221 - 2⁵ = 22222211189 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 (22222211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587300795 + ... + 1587300808.

It is an arithmetic number, because the mean of its divisors is an integer number (6349203208).

Almost surely, 2^22222211221 is an apocalyptic number.

It is an amenable number.

22222211221 is a deficient number, since it is larger than the sum of its proper divisors (3174601611).

22222211221 is an equidigital number, since it uses as much as digits as its factorization.

22222211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174601610.

The product of its digits is 256, while the sum is 19.

Adding to 22222211221 its reverse (12211222222), we get a palindrome (34433433443).

The spelling of 22222211221 in words is "twenty-two billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".