242321221 has 2 divisors, whose sum is σ = 242321222. Its totient is φ = 242321220.

The previous prime is 242321161. The next prime is 242321263. The reversal of 242321221 is 122123242.

242321221 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., 132365025 + 109956196 = 11505^2 + 10486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242321221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242321021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121160610 + 121160611.

It is an arithmetic number, because the mean of its divisors is an integer number (121160611).

Almost surely, 2^242321221 is an apocalyptic number.

It is an amenable number.

242321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242321221 is an equidigital number, since it uses as much as digits as its factorization.

242321221 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 242321221 is about 15566.6701962880. The cubic root of 242321221 is about 623.4435691744.

Adding to 242321221 its reverse (122123242), we get a palindrome (364444463).

The spelling of 242321221 in words is "two hundred forty-two million, three hundred twenty-one thousand, two hundred twenty-one".