505408221 has 16 divisors (see below), whose sum is σ = 772907520. Its totient is φ = 326069280.

The previous prime is 505408199. The next prime is 505408223. The reversal of 505408221 is 122804505.

It is a happy number.

It is not a de Polignac number, because 505408221 - 2⁶ = 505408157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505408223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301080 + ... + 302753.

It is an arithmetic number, because the mean of its divisors is an integer number (48306720).

Almost surely, 2^505408221 is an apocalyptic number.

It is an amenable number.

505408221 is a deficient number, since it is larger than the sum of its proper divisors (267499299).

505408221 is a wasteful number, since it uses less digits than its factorization.

505408221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603873 (or 603867 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 505408221 is about 22481.2860174857. The cubic root of 505408221 is about 796.5519417398.

The spelling of 505408221 in words is "five hundred five million, four hundred eight thousand, two hundred twenty-one".