242213221 has 2 divisors, whose sum is σ = 242213222. Its totient is φ = 242213220.

The previous prime is 242213219. The next prime is 242213239. The reversal of 242213221 is 122312242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181980100 + 60233121 = 13490^2 + 7761^2 .

It is a cyclic number.

It is not a de Polignac number, because 242213221 - 2¹ = 242213219 is a prime.

Together with 242213219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242213201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121106610 + 121106611.

It is an arithmetic number, because the mean of its divisors is an integer number (121106611).

Almost surely, 2^242213221 is an apocalyptic number.

It is an amenable number.

242213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242213221 is an equidigital number, since it uses as much as digits as its factorization.

242213221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 19.

The square root of 242213221 is about 15563.2008597203. The cubic root of 242213221 is about 623.3509346805.

Adding to 242213221 its reverse (122312242), we get a palindrome (364525463).

The spelling of 242213221 in words is "two hundred forty-two million, two hundred thirteen thousand, two hundred twenty-one".