310242221 has 2 divisors, whose sum is σ = 310242222. Its totient is φ = 310242220.

The previous prime is 310242217. The next prime is 310242223. The reversal of 310242221 is 122242013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167702500 + 142539721 = 12950^2 + 11939^2 .

It is a cyclic number.

It is not a de Polignac number, because 310242221 - 2² = 310242217 is a prime.

It is a Sophie Germain prime.

Together with 310242223, it forms a pair of twin primes.

It is a Chen 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 310242221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (310242223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155121110 + 155121111.

It is an arithmetic number, because the mean of its divisors is an integer number (155121111).

Almost surely, 2^310242221 is an apocalyptic number.

It is an amenable number.

310242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

310242221 is an equidigital number, since it uses as much as digits as its factorization.

310242221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 310242221 is about 17613.6941326912. The cubic root of 310242221 is about 676.9661710807.

Adding to 310242221 its reverse (122242013), we get a palindrome (432484234).

The spelling of 310242221 in words is "three hundred ten million, two hundred forty-two thousand, two hundred twenty-one".