442342221 has 4 divisors (see below), whose sum is σ = 589789632. Its totient is φ = 294894812.

The previous prime is 442342217. The next prime is 442342231. The reversal of 442342221 is 122243244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 442342221 - 2² = 442342217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442342191 and 442342200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442342231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73723701 + ... + 73723706.

It is an arithmetic number, because the mean of its divisors is an integer number (147447408).

Almost surely, 2^442342221 is an apocalyptic number.

It is an amenable number.

442342221 is a deficient number, since it is larger than the sum of its proper divisors (147447411).

442342221 is a wasteful number, since it uses less digits than its factorization.

442342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147447410.

The product of its digits is 3072, while the sum is 24.

The square root of 442342221 is about 21031.9333633406. The cubic root of 442342221 is about 761.9377037271.

Adding to 442342221 its reverse (122243244), we get a palindrome (564585465).

The spelling of 442342221 in words is "four hundred forty-two million, three hundred forty-two thousand, two hundred twenty-one".