321671 has 4 divisors (see below), whose sum is σ = 367632. Its totient is φ = 275712.

The previous prime is 321661. The next prime is 321679. The reversal of 321671 is 176123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321671 - 2¹⁰ = 320647 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321671.

It is not an unprimeable number, because it can be changed into a prime (321679) 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, 22970 + ... + 22983.

It is an arithmetic number, because the mean of its divisors is an integer number (91908).

2³²¹⁶⁷¹ is an apocalyptic number.

321671 is a deficient number, since it is larger than the sum of its proper divisors (45961).

321671 is an equidigital number, since it uses as much as digits as its factorization.

321671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45960.

The product of its digits is 252, while the sum is 20.

The square root of 321671 is about 567.1604711191. The cubic root of 321671 is about 68.5178883077.

Adding to 321671 its reverse (176123), we get a palindrome (497794).

The spelling of 321671 in words is "three hundred twenty-one thousand, six hundred seventy-one".