242016221 has 2 divisors, whose sum is σ = 242016222. Its totient is φ = 242016220.

The previous prime is 242016211. The next prime is 242016227. The reversal of 242016221 is 122610242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191407225 + 50608996 = 13835^2 + 7114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242016221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242016193 and 242016202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242016227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121008110 + 121008111.

It is an arithmetic number, because the mean of its divisors is an integer number (121008111).

Almost surely, 2^242016221 is an apocalyptic number.

It is an amenable number.

242016221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242016221 is an equidigital number, since it uses as much as digits as its factorization.

242016221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 242016221 is about 15556.8705400540. The cubic root of 242016221 is about 623.1818915524.

Adding to 242016221 its reverse (122610242), we get a palindrome (364626463).

The spelling of 242016221 in words is "two hundred forty-two million, sixteen thousand, two hundred twenty-one".