242312221 has 2 divisors, whose sum is σ = 242312222. Its totient is φ = 242312220.

The previous prime is 242312183. The next prime is 242312243. The reversal of 242312221 is 122213242.

242312221 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., 192820996 + 49491225 = 13886^2 + 7035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242312221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242312251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121156110 + 121156111.

It is an arithmetic number, because the mean of its divisors is an integer number (121156111).

Almost surely, 2^242312221 is an apocalyptic number.

It is an amenable number.

242312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242312221 is an equidigital number, since it uses as much as digits as its factorization.

242312221 is an evil number, because the sum of its binary digits is even.

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

The square root of 242312221 is about 15566.3811144402. The cubic root of 242312221 is about 623.4358506846.

Adding to 242312221 its reverse (122213242), we get a palindrome (364525463).

The spelling of 242312221 in words is "two hundred forty-two million, three hundred twelve thousand, two hundred twenty-one".