142442321 has 4 divisors (see below), whose sum is σ = 162791232. Its totient is φ = 122093412.

The previous prime is 142442281. The next prime is 142442347. The reversal of 142442321 is 123244241.

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 142442321 - 2⁶ = 142442257 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 (144442321) 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, 10174445 + ... + 10174458.

It is an arithmetic number, because the mean of its divisors is an integer number (40697808).

Almost surely, 2^142442321 is an apocalyptic number.

It is an amenable number.

142442321 is a deficient number, since it is larger than the sum of its proper divisors (20348911).

142442321 is an equidigital number, since it uses as much as digits as its factorization.

142442321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20348910.

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

The square root of 142442321 is about 11934.9202343376. The cubic root of 142442321 is about 522.2514813662.

Adding to 142442321 its reverse (123244241), we get a palindrome (265686562).

The spelling of 142442321 in words is "one hundred forty-two million, four hundred forty-two thousand, three hundred twenty-one".