56504221 has 2 divisors, whose sum is σ = 56504222. Its totient is φ = 56504220.

The previous prime is 56504219. The next prime is 56504237. The reversal of 56504221 is 12240565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44156025 + 12348196 = 6645^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 56504221 - 2¹ = 56504219 is a prime.

Together with 56504219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56504251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28252110 + 28252111.

It is an arithmetic number, because the mean of its divisors is an integer number (28252111).

Almost surely, 2^56504221 is an apocalyptic number.

It is an amenable number.

56504221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56504221 is an equidigital number, since it uses as much as digits as its factorization.

56504221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 56504221 is about 7516.9289606860. The cubic root of 56504221 is about 383.7310693870.

Adding to 56504221 its reverse (12240565), we get a palindrome (68744786).

The spelling of 56504221 in words is "fifty-six million, five hundred four thousand, two hundred twenty-one".