504821221 has 2 divisors, whose sum is σ = 504821222. Its totient is φ = 504821220.

The previous prime is 504821209. The next prime is 504821243. The reversal of 504821221 is 122128405.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484616196 + 20205025 = 22014^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 504821221 - 2¹¹ = 504819173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504821281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252410610 + 252410611.

It is an arithmetic number, because the mean of its divisors is an integer number (252410611).

Almost surely, 2^504821221 is an apocalyptic number.

It is an amenable number.

504821221 is a deficient number, since it is larger than the sum of its proper divisors (1).

504821221 is an equidigital number, since it uses as much as digits as its factorization.

504821221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 504821221 is about 22468.2269215886. The cubic root of 504821221 is about 796.2434405407.

Adding to 504821221 its reverse (122128405), we get a palindrome (626949626).

The spelling of 504821221 in words is "five hundred four million, eight hundred twenty-one thousand, two hundred twenty-one".