22244444221 has 2 divisors, whose sum is σ = 22244444222. Its totient is φ = 22244444220.

The previous prime is 22244444213. The next prime is 22244444231. The reversal of 22244444221 is 12244444222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13630562500 + 8613881721 = 116750^2 + 92811^2 .

It is a cyclic number.

It is not a de Polignac number, because 22244444221 - 2³ = 22244444213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22244444231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11122222110 + 11122222111.

It is an arithmetic number, because the mean of its divisors is an integer number (11122222111).

Almost surely, 2^22244444221 is an apocalyptic number.

It is an amenable number.

22244444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22244444221 is an equidigital number, since it uses as much as digits as its factorization.

22244444221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32768, while the sum is 31.

Adding to 22244444221 its reverse (12244444222), we get a palindrome (34488888443).

Subtracting from 22244444221 its reverse (12244444222), we obtain a palindrome (9999999999).

The spelling of 22244444221 in words is "twenty-two billion, two hundred forty-four million, four hundred forty-four thousand, two hundred twenty-one".