442421321 has 8 divisors (see below), whose sum is σ = 456065664. Its totient is φ = 428865840.

The previous prime is 442421279. The next prime is 442421347. The reversal of 442421321 is 123124244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442421321 - 2⁶ = 442421257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (442421381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12035 + ... + 32088.

It is an arithmetic number, because the mean of its divisors is an integer number (57008208).

Almost surely, 2^442421321 is an apocalyptic number.

It is an amenable number.

442421321 is a deficient number, since it is larger than the sum of its proper divisors (13644343).

442421321 is a wasteful number, since it uses less digits than its factorization.

442421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44431.

The product of its digits is 1536, while the sum is 23.

The square root of 442421321 is about 21033.8137530977. The cubic root of 442421321 is about 761.9831177959.

Adding to 442421321 its reverse (123124244), we get a palindrome (565545565).

The spelling of 442421321 in words is "four hundred forty-two million, four hundred twenty-one thousand, three hundred twenty-one".