22210212221 has 2 divisors, whose sum is σ = 22210212222. Its totient is φ = 22210212220.

The previous prime is 22210212217. The next prime is 22210212253. The reversal of 22210212221 is 12221201222.

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., 22205172196 + 5040025 = 149014^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 22210212221 - 2² = 22210212217 is a prime.

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 22210212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22210212121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11105106110 + 11105106111.

It is an arithmetic number, because the mean of its divisors is an integer number (11105106111).

Almost surely, 2^22210212221 is an apocalyptic number.

It is an amenable number.

22210212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22210212221 is an equidigital number, since it uses as much as digits as its factorization.

22210212221 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 22210212221 its reverse (12221201222), we get a palindrome (34431413443).

The spelling of 22210212221 in words is "twenty-two billion, two hundred ten million, two hundred twelve thousand, two hundred twenty-one".