442608221 has 4 divisors (see below), whose sum is σ = 482845344. Its totient is φ = 402371100.

The previous prime is 442608193. The next prime is 442608241. The reversal of 442608221 is 122806244.

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 442608221 - 2⁶ = 442608157 is a prime.

It is a super-3 number, since 3×442608221³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442608241) 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, 20118545 + ... + 20118566.

It is an arithmetic number, because the mean of its divisors is an integer number (120711336).

Almost surely, 2^442608221 is an apocalyptic number.

It is an amenable number.

442608221 is a deficient number, since it is larger than the sum of its proper divisors (40237123).

442608221 is a wasteful number, since it uses less digits than its factorization.

442608221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40237122.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 442608221 is about 21038.2561302024. The cubic root of 442608221 is about 762.0904021034.

The spelling of 442608221 in words is "four hundred forty-two million, six hundred eight thousand, two hundred twenty-one".