242005121 has 2 divisors, whose sum is σ = 242005122. Its totient is φ = 242005120.

The previous prime is 242005067. The next prime is 242005171. The reversal of 242005121 is 121500242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137147521 + 104857600 = 11711^2 + 10240^2 .

It is a cyclic number.

It is not a de Polignac number, because 242005121 - 2²⁶ = 174896257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242005121.

It is not a weakly prime, because it can be changed into another prime (242005171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121002560 + 121002561.

It is an arithmetic number, because the mean of its divisors is an integer number (121002561).

Almost surely, 2^242005121 is an apocalyptic number.

It is an amenable number.

242005121 is a deficient number, since it is larger than the sum of its proper divisors (1).

242005121 is an equidigital number, since it uses as much as digits as its factorization.

242005121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 242005121 is about 15556.5137804072. The cubic root of 242005121 is about 623.1723640577.

Adding to 242005121 its reverse (121500242), we get a palindrome (363505363).

The spelling of 242005121 in words is "two hundred forty-two million, five thousand, one hundred twenty-one".