2665321 has 2 divisors, whose sum is σ = 2665322. Its totient is φ = 2665320.

The previous prime is 2665319. The next prime is 2665343. The reversal of 2665321 is 1235662.

2665321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2496400 + 168921 = 1580^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665321 - 2¹ = 2665319 is a prime.

Together with 2665319, it forms a pair of twin primes.

2665321 is a lucky number.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (2665391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332660 + 1332661.

It is an arithmetic number, because the mean of its divisors is an integer number (1332661).

2^2665321 is an apocalyptic number.

It is an amenable number.

2665321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665321 is an equidigital number, since it uses as much as digits as its factorization.

2665321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 2665321 is about 1632.5810852757. The cubic root of 2665321 is about 138.6489251166.

The spelling of 2665321 in words is "two million, six hundred sixty-five thousand, three hundred twenty-one".