42321 has 4 divisors (see below), whose sum is σ = 56432. Its totient is φ = 28212.

The previous prime is 42307. The next prime is 42323. The reversal of 42321 is 12324.

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 not a de Polignac number, because 42321 - 2⁶ = 42257 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 42297 and 42306.

It is not an unprimeable number, because it can be changed into a prime (42323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7051 + ... + 7056.

It is an arithmetic number, because the mean of its divisors is an integer number (14108).

2⁴²³²¹ is an apocalyptic number.

It is an amenable number.

42321 is a deficient number, since it is larger than the sum of its proper divisors (14111).

42321 is a wasteful number, since it uses less digits than its factorization.

42321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14110.

The product of its digits is 48, while the sum is 12.

The square root of 42321 is about 205.7206844243. The cubic root of 42321 is about 34.8485977121.

Adding to 42321 its reverse (12324), we get a palindrome (54645).

It can be divided in two parts, 423 and 21, that added together give a palindrome (444).

The spelling of 42321 in words is "forty-two thousand, three hundred twenty-one", and thus it is an iban number.