242247221 has 2 divisors, whose sum is σ = 242247222. Its totient is φ = 242247220.

The previous prime is 242247209. The next prime is 242247223. The reversal of 242247221 is 122742242.

242247221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144336196 + 97911025 = 12014^2 + 9895^2 .

It is a cyclic number.

It is not a de Polignac number, because 242247221 - 2¹⁴ = 242230837 is a prime.

Together with 242247223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242247223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121123610 + 121123611.

It is an arithmetic number, because the mean of its divisors is an integer number (121123611).

Almost surely, 2^242247221 is an apocalyptic number.

It is an amenable number.

242247221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242247221 is an equidigital number, since it uses as much as digits as its factorization.

242247221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 26.

The square root of 242247221 is about 15564.2931416753. The cubic root of 242247221 is about 623.3801003609.

Adding to 242247221 its reverse (122742242), we get a palindrome (364989463).

The spelling of 242247221 in words is "two hundred forty-two million, two hundred forty-seven thousand, two hundred twenty-one".