22220112221 has 2 divisors, whose sum is σ = 22220112222. Its totient is φ = 22220112220.

The previous prime is 22220112209. The next prime is 22220112311. The reversal of 22220112221 is 12221102222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22167040996 + 53071225 = 148886^2 + 7285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22220112221 is a prime.

It is a super-2 number, since 2×22220112221² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22220112221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22220117221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110056110 + 11110056111.

It is an arithmetic number, because the mean of its divisors is an integer number (11110056111).

Almost surely, 2^22220112221 is an apocalyptic number.

It is an amenable number.

22220112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220112221 is an equidigital number, since it uses as much as digits as its factorization.

22220112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22220112221 its reverse (12221102222), we get a palindrome (34441214443).

Subtracting from 22220112221 its reverse (12221102222), we obtain a palindrome (9999009999).

The spelling of 22220112221 in words is "twenty-two billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".