2520439321 has 4 divisors (see below), whose sum is σ = 2521277200. Its totient is φ = 2519601444.

The previous prime is 2520439309. The next prime is 2520439379. The reversal of 2520439321 is 1239340252.

2520439321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2520439321 - 2¹¹ = 2520437273 is a prime.

It is a super-2 number, since 2×2520439321² = 12705228741685882082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2520439381) 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, 414411 + ... + 420448.

It is an arithmetic number, because the mean of its divisors is an integer number (630319300).

Almost surely, 2^2520439321 is an apocalyptic number.

It is an amenable number.

2520439321 is a deficient number, since it is larger than the sum of its proper divisors (837879).

2520439321 is an equidigital number, since it uses as much as digits as its factorization.

2520439321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837878.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2520439321 is about 50203.9771432503. The cubic root of 2520439321 is about 1360.8974974463.

Adding to 2520439321 its reverse (1239340252), we get a palindrome (3759779573).

The spelling of 2520439321 in words is "two billion, five hundred twenty million, four hundred thirty-nine thousand, three hundred twenty-one".