57230221 has 2 divisors, whose sum is σ = 57230222. Its totient is φ = 57230220.

The previous prime is 57230213. The next prime is 57230227. The reversal of 57230221 is 12203275.

57230221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45765225 + 11464996 = 6765^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 57230221 - 2³ = 57230213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57230192 and 57230201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57230227) 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, 28615110 + 28615111.

It is an arithmetic number, because the mean of its divisors is an integer number (28615111).

Almost surely, 2^57230221 is an apocalyptic number.

It is an amenable number.

57230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57230221 is an equidigital number, since it uses as much as digits as its factorization.

57230221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 57230221 is about 7565.0658291914. The cubic root of 57230221 is about 385.3675491508.

Adding to 57230221 its reverse (12203275), we get a palindrome (69433496).

The spelling of 57230221 in words is "fifty-seven million, two hundred thirty thousand, two hundred twenty-one".