505025221 has 2 divisors, whose sum is σ = 505025222. Its totient is φ = 505025220.

The previous prime is 505025179. The next prime is 505025243. The reversal of 505025221 is 122520505.

It is an a-pointer prime, because the next prime (505025243) can be obtained adding 505025221 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278522721 + 226502500 = 16689^2 + 15050^2 .

It is a cyclic number.

It is not a de Polignac number, because 505025221 - 2⁷ = 505025093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505025192 and 505025201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505025251) 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, 252512610 + 252512611.

It is an arithmetic number, because the mean of its divisors is an integer number (252512611).

Almost surely, 2^505025221 is an apocalyptic number.

It is an amenable number.

505025221 is a deficient number, since it is larger than the sum of its proper divisors (1).

505025221 is an equidigital number, since it uses as much as digits as its factorization.

505025221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 505025221 is about 22472.7662071228. The cubic root of 505025221 is about 796.3506810052.

Adding to 505025221 its reverse (122520505), we get a palindrome (627545726).

The spelling of 505025221 in words is "five hundred five million, twenty-five thousand, two hundred twenty-one".