321231 has 4 divisors (see below), whose sum is σ = 428312. Its totient is φ = 214152.

The previous prime is 321227. The next prime is 321239. The reversal of 321231 is 132123.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132123 = 3 ⋅44041.

It is not a de Polignac number, because 321231 - 2² = 321227 is a prime.

It is a super-2 number, since 2×321231² = 206378710722, which contains 22 as substring.

It is a D-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 321231.

It is not an unprimeable number, because it can be changed into a prime (321239) 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, 53536 + ... + 53541.

It is an arithmetic number, because the mean of its divisors is an integer number (107078).

2³²¹²³¹ is an apocalyptic number.

321231 is a deficient number, since it is larger than the sum of its proper divisors (107081).

321231 is a wasteful number, since it uses less digits than its factorization.

321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107080.

The product of its digits is 36, while the sum is 12.

The square root of 321231 is about 566.7724411084. The cubic root of 321231 is about 68.4866331565.

Adding to 321231 its reverse (132123), we get a palindrome (453354).

The spelling of 321231 in words is "three hundred twenty-one thousand, two hundred thirty-one".