2663321 has 4 divisors (see below), whose sum is σ = 2707044. Its totient is φ = 2619600.

The previous prime is 2663299. The next prime is 2663347. The reversal of 2663321 is 1233662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1125721 + 1537600 = 1061^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2663321 - 2¹⁴ = 2646937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2663351) 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, 21770 + ... + 21891.

It is an arithmetic number, because the mean of its divisors is an integer number (676761).

2^2663321 is an apocalyptic number.

It is an amenable number.

2663321 is a deficient number, since it is larger than the sum of its proper divisors (43723).

2663321 is an equidigital number, since it uses as much as digits as its factorization.

2663321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43722.

The product of its digits is 1296, while the sum is 23.

The square root of 2663321 is about 1631.9684433224. The cubic root of 2663321 is about 138.6142367071.

Adding to 2663321 its reverse (1233662), we get a palindrome (3896983).

The spelling of 2663321 in words is "two million, six hundred sixty-three thousand, three hundred twenty-one".