475730221 has 4 divisors (see below), whose sum is σ = 475847200. Its totient is φ = 475613244.

The previous prime is 475730219. The next prime is 475730237. The reversal of 475730221 is 122037574.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 475730221 - 2¹ = 475730219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (475730251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52161 + ... + 60598.

It is an arithmetic number, because the mean of its divisors is an integer number (118961800).

Almost surely, 2^475730221 is an apocalyptic number.

It is an amenable number.

475730221 is a deficient number, since it is larger than the sum of its proper divisors (116979).

475730221 is a wasteful number, since it uses less digits than its factorization.

475730221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116978.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 475730221 is about 21811.2407029036. The cubic root of 475730221 is about 780.6449962987.

Adding to 475730221 its reverse (122037574), we get a palindrome (597767795).

The spelling of 475730221 in words is "four hundred seventy-five million, seven hundred thirty thousand, two hundred twenty-one".