231321 has 8 divisors (see below), whose sum is σ = 312480. Its totient is φ = 152192.

The previous prime is 231317. The next prime is 231323. The reversal of 231321 is 123132.

It is a happy number.

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 231321 - 2² = 231317 is a prime.

It is a Curzon number.

231321 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 231297 and 231306.

It is not an unprimeable number, because it can be changed into a prime (231323) 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, 216 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2²³¹³²¹ is an apocalyptic number.

It is an amenable number.

231321 is a deficient number, since it is larger than the sum of its proper divisors (81159).

231321 is an equidigital number, since it uses as much as digits as its factorization.

231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015.

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

The square root of 231321 is about 480.9584181611. The cubic root of 231321 is about 61.3863324450.

Adding to 231321 its reverse (123132), we get a palindrome (354453).

The spelling of 231321 in words is "two hundred thirty-one thousand, three hundred twenty-one".