505335221 has 4 divisors (see below), whose sum is σ = 506743200. Its totient is φ = 503927244.

The previous prime is 505335199. The next prime is 505335223. The reversal of 505335221 is 122533505.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122533505 = 5 ⋅24506701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505335221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505335223) 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, 703451 + ... + 704168.

It is an arithmetic number, because the mean of its divisors is an integer number (126685800).

Almost surely, 2^505335221 is an apocalyptic number.

It is an amenable number.

505335221 is a deficient number, since it is larger than the sum of its proper divisors (1407979).

505335221 is a wasteful number, since it uses less digits than its factorization.

505335221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407978.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 505335221 is about 22479.6623862548. The cubic root of 505335221 is about 796.5135891837.

Adding to 505335221 its reverse (122533505), we get a palindrome (627868726).

The spelling of 505335221 in words is "five hundred five million, three hundred thirty-five thousand, two hundred twenty-one".