242240221 has 4 divisors (see below), whose sum is σ = 248787292. Its totient is φ = 235693152.

The previous prime is 242240213. The next prime is 242240227. The reversal of 242240221 is 122042242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167417721 + 74822500 = 12939^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 242240221 - 2³ = 242240213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242240227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3273480 + ... + 3273553.

It is an arithmetic number, because the mean of its divisors is an integer number (62196823).

Almost surely, 2^242240221 is an apocalyptic number.

It is an amenable number.

242240221 is a deficient number, since it is larger than the sum of its proper divisors (6547071).

242240221 is an equidigital number, since it uses as much as digits as its factorization.

242240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547070.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 242240221 is about 15564.0682663628. The cubic root of 242240221 is about 623.3740958851.

Adding to 242240221 its reverse (122042242), we get a palindrome (364282463).

The spelling of 242240221 in words is "two hundred forty-two million, two hundred forty thousand, two hundred twenty-one".