320042321 has 8 divisors (see below), whose sum is σ = 323516544. Its totient is φ = 316575360.

The previous prime is 320042311. The next prime is 320042339. The reversal of 320042321 is 123240023.

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 320042321 - 2⁶ = 320042257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320042321.

It is not an unprimeable number, because it can be changed into a prime (320042311) 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, 173876 + ... + 175706.

It is an arithmetic number, because the mean of its divisors is an integer number (40439568).

Almost surely, 2^320042321 is an apocalyptic number.

It is an amenable number.

320042321 is a deficient number, since it is larger than the sum of its proper divisors (3474223).

320042321 is a wasteful number, since it uses less digits than its factorization.

320042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 320042321 is about 17889.7266888010. The cubic root of 320042321 is about 684.0205306298.

Adding to 320042321 its reverse (123240023), we get a palindrome (443282344).

The spelling of 320042321 in words is "three hundred twenty million, forty-two thousand, three hundred twenty-one".