4030321 has 2 divisors, whose sum is σ = 4030322. Its totient is φ = 4030320.

The previous prime is 4030319. The next prime is 4030339. The reversal of 4030321 is 1230304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3240000 + 790321 = 1800^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 4030321 - 2¹ = 4030319 is a prime.

Together with 4030319, it forms a pair of twin primes.

4030321 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4030121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015160 + 2015161.

It is an arithmetic number, because the mean of its divisors is an integer number (2015161).

Almost surely, 2^4030321 is an apocalyptic number.

It is an amenable number.

4030321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4030321 is an equidigital number, since it uses as much as digits as its factorization.

4030321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 4030321 is about 2007.5659391412. The cubic root of 4030321 is about 159.1401925334.

Adding to 4030321 its reverse (1230304), we get a palindrome (5260625).

The spelling of 4030321 in words is "four million, thirty thousand, three hundred twenty-one".