3240240821 has 2 divisors, whose sum is σ = 3240240822. Its totient is φ = 3240240820.

The previous prime is 3240240803. The next prime is 3240240859. The reversal of 3240240821 is 1280420423.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3183780625 + 56460196 = 56425^2 + 7514^2 .

It is an emirp because it is prime and its reverse (1280420423) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3240240821 - 2¹⁴ = 3240224437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3240240881) 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 as a sum of consecutive naturals, namely, 1620120410 + 1620120411.

It is an arithmetic number, because the mean of its divisors is an integer number (1620120411).

Almost surely, 2^3240240821 is an apocalyptic number.

It is an amenable number.

3240240821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3240240821 is an equidigital number, since it uses as much as digits as its factorization.

3240240821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 3240240821 is about 56923.1132405809. The cubic root of 3240240821 is about 1479.7639051504.

The spelling of 3240240821 in words is "three billion, two hundred forty million, two hundred forty thousand, eight hundred twenty-one".