4521321 has 24 divisors (see below), whose sum is σ = 7641920. Its totient is φ = 2522016.

The previous prime is 4521313. The next prime is 4521331. The reversal of 4521321 is 1231254.

It is not a de Polignac number, because 4521321 - 2³ = 4521313 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4521294 and 4521303.

It is not an unprimeable number, because it can be changed into a prime (4521301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1875 + ... + 3543.

Almost surely, 2^4521321 is an apocalyptic number.

It is an amenable number.

4521321 is a deficient number, since it is larger than the sum of its proper divisors (3120599).

4521321 is a wasteful number, since it uses less digits than its factorization.

4521321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1722 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 4521321 is about 2126.3398129180. The cubic root of 4521321 is about 165.3566939149.

Adding to 4521321 its reverse (1231254), we get a palindrome (5752575).

The spelling of 4521321 in words is "four million, five hundred twenty-one thousand, three hundred twenty-one".