505011221 has 16 divisors (see below), whose sum is σ = 607104960. Its totient is φ = 413925120.

The previous prime is 505011179. The next prime is 505011229. The reversal of 505011221 is 122110505.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505011221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505011229) 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, 34916 + ... + 47213.

It is an arithmetic number, because the mean of its divisors is an integer number (37944060).

Almost surely, 2^505011221 is an apocalyptic number.

It is an amenable number.

505011221 is a deficient number, since it is larger than the sum of its proper divisors (102093739).

505011221 is a wasteful number, since it uses less digits than its factorization.

505011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82196.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 505011221 is about 22472.4547168306. The cubic root of 505011221 is about 796.3433222885.

Adding to 505011221 its reverse (122110505), we get a palindrome (627121726).

The spelling of 505011221 in words is "five hundred five million, eleven thousand, two hundred twenty-one".