222232311221 has 2 divisors, whose sum is σ = 222232311222. Its totient is φ = 222232311220.

The previous prime is 222232311199. The next prime is 222232311241. The reversal of 222232311221 is 122113232222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211035496996 + 11196814225 = 459386^2 + 105815^2 .

It is a cyclic number.

It is not a de Polignac number, because 222232311221 - 2¹⁸ = 222232049077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222232311241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111116155610 + 111116155611.

It is an arithmetic number, because the mean of its divisors is an integer number (111116155611).

Almost surely, 2^222232311221 is an apocalyptic number.

It is an amenable number.

222232311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222232311221 is an equidigital number, since it uses as much as digits as its factorization.

222232311221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

Adding to 222232311221 its reverse (122113232222), we get a palindrome (344345543443).

The spelling of 222232311221 in words is "two hundred twenty-two billion, two hundred thirty-two million, three hundred eleven thousand, two hundred twenty-one".