550221 has 24 divisors (see below), whose sum is σ = 902880. Its totient is φ = 296352.

The previous prime is 550213. The next prime is 550241. The reversal of 550221 is 122055.

It is not a de Polignac number, because 550221 - 2³ = 550213 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2695 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (37620).

2⁵⁵⁰²²¹ is an apocalyptic number.

It is an amenable number.

550221 is a deficient number, since it is larger than the sum of its proper divisors (352659).

550221 is a wasteful number, since it uses less digits than its factorization.

550221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 550221 is about 741.7688319146. The cubic root of 550221 is about 81.9430995300.

Adding to 550221 its reverse (122055), we get a palindrome (672276).

The spelling of 550221 in words is "five hundred fifty thousand, two hundred twenty-one".