242440221 has 16 divisors (see below), whose sum is σ = 328440960. Its totient is φ = 159042240.

The previous prime is 242440207. The next prime is 242440223. The reversal of 242440221 is 122044242.

It is not a de Polignac number, because 242440221 - 2⁹ = 242439709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242440223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175891 + ... + 177263.

It is an arithmetic number, because the mean of its divisors is an integer number (20527560).

Almost surely, 2^242440221 is an apocalyptic number.

It is an amenable number.

242440221 is a deficient number, since it is larger than the sum of its proper divisors (86000739).

242440221 is a wasteful number, since it uses less digits than its factorization.

242440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 242440221 is about 15570.4919960803. The cubic root of 242440221 is about 623.5456067965.

Adding to 242440221 its reverse (122044242), we get a palindrome (364484463).

The spelling of 242440221 in words is "two hundred forty-two million, four hundred forty thousand, two hundred twenty-one".