538221 has 4 divisors (see below), whose sum is σ = 717632. Its totient is φ = 358812.

The previous prime is 538201. The next prime is 538247. The reversal of 538221 is 122835.

538221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 538221 - 2⁶ = 538157 is a prime.

It is a d-powerful number, because it can be written as 5⁴ + 3¹¹ + 2¹⁶ + 8⁵ + 2¹⁸ + 1 .

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 538221.

It is not an unprimeable number, because it can be changed into a prime (538201) 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, 89701 + ... + 89706.

It is an arithmetic number, because the mean of its divisors is an integer number (179408).

2⁵³⁸²²¹ is an apocalyptic number.

It is an amenable number.

538221 is a deficient number, since it is larger than the sum of its proper divisors (179411).

538221 is a wasteful number, since it uses less digits than its factorization.

538221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179410.

The product of its digits is 480, while the sum is 21.

The square root of 538221 is about 733.6354680630. The cubic root of 538221 is about 81.3430051355.

It can be divided in two parts, 5 and 38221, that added together give a triangular number (38226 = T₂₇₆).

The spelling of 538221 in words is "five hundred thirty-eight thousand, two hundred twenty-one".