8240504221 has 2 divisors, whose sum is σ = 8240504222. Its totient is φ = 8240504220.

The previous prime is 8240504203. The next prime is 8240504281. The reversal of 8240504221 is 1224050428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8053088121 + 187416100 = 89739^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 8240504221 - 2⁹ = 8240503709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8240504221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8240504201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4120252110 + 4120252111.

It is an arithmetic number, because the mean of its divisors is an integer number (4120252111).

Almost surely, 2^8240504221 is an apocalyptic number.

It is an amenable number.

8240504221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8240504221 is an equidigital number, since it uses as much as digits as its factorization.

8240504221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 8240504221 is about 90777.2230297887. The cubic root of 8240504221 is about 2019.8444657719.

Adding to 8240504221 its reverse (1224050428), we get a palindrome (9464554649).

The spelling of 8240504221 in words is "eight billion, two hundred forty million, five hundred four thousand, two hundred twenty-one".