4421321 has 2 divisors, whose sum is σ = 4421322. Its totient is φ = 4421320.

The previous prime is 4421299. The next prime is 4421323. The reversal of 4421321 is 1231244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3763600 + 657721 = 1940^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4421321 - 2⁶ = 4421257 is a prime.

It is a Sophie Germain prime.

Together with 4421323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4421321.

It is not a weakly prime, because it can be changed into another prime (4421323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2210660 + 2210661.

It is an arithmetic number, because the mean of its divisors is an integer number (2210661).

Almost surely, 2^4421321 is an apocalyptic number.

It is an amenable number.

4421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4421321 is an equidigital number, since it uses as much as digits as its factorization.

4421321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 17.

The square root of 4421321 is about 2102.6937485045. The cubic root of 4421321 is about 164.1285057645.

Adding to 4421321 its reverse (1231244), we get a palindrome (5652565).

It can be divided in two parts, 4421 and 321, that multiplied together give a palindrome (1419141).

The spelling of 4421321 in words is "four million, four hundred twenty-one thousand, three hundred twenty-one".