3240320521 has 4 divisors (see below), whose sum is σ = 3260199952. Its totient is φ = 3220441092.

The previous prime is 3240320509. The next prime is 3240320537. The reversal of 3240320521 is 1250230423.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1250230423 = 13 ⋅96171571.

It is a cyclic number.

It is not a de Polignac number, because 3240320521 - 2¹⁵ = 3240287753 is a prime.

It is a super-2 number, since 2×3240320521² = 20999354157627422882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3240320492 and 3240320501.

It is not an unprimeable number, because it can be changed into a prime (3240320221) 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 3 ways as a sum of consecutive naturals, for example, 9939471 + ... + 9939796.

It is an arithmetic number, because the mean of its divisors is an integer number (815049988).

Almost surely, 2^3240320521 is an apocalyptic number.

It is an amenable number.

3240320521 is a deficient number, since it is larger than the sum of its proper divisors (19879431).

3240320521 is a wasteful number, since it uses less digits than its factorization.

3240320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19879430.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 3240320521 is about 56923.8133033970. The cubic root of 3240320521 is about 1479.7760376042.

Adding to 3240320521 its reverse (1250230423), we get a palindrome (4490550944).

It can be divided in two parts, 3240 and 320521, that added together give a square (323761 = 569²).

The spelling of 3240320521 in words is "three billion, two hundred forty million, three hundred twenty thousand, five hundred twenty-one".