263321 has 4 divisors (see below), whose sum is σ = 277200. Its totient is φ = 249444.

The previous prime is 263303. The next prime is 263323. The reversal of 263321 is 123362.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123362 = 2 ⋅61681.

It is a cyclic number.

It is not a de Polignac number, because 263321 - 2⁶ = 263257 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 263321.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 263321.

It is not an unprimeable number, because it can be changed into a prime (263323) 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, 6911 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2²⁶³³²¹ is an apocalyptic number.

It is an amenable number.

263321 is a deficient number, since it is larger than the sum of its proper divisors (13879).

263321 is a wasteful number, since it uses less digits than its factorization.

263321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13878.

The product of its digits is 216, while the sum is 17.

The square root of 263321 is about 513.1481267626. The cubic root of 263321 is about 64.0956415075.

Adding to 263321 its reverse (123362), we get a palindrome (386683).

The spelling of 263321 in words is "two hundred sixty-three thousand, three hundred twenty-one".