73221 has 4 divisors (see below), whose sum is σ = 97632. Its totient is φ = 48812.

The previous prime is 73189. The next prime is 73237. The reversal of 73221 is 12237.

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: 12237 = 3 ⋅4079.

It is a cyclic number.

It is not a de Polignac number, because 73221 - 2⁵ = 73189 is a prime.

It is a super-2 number, since 2×73221² = 10722629682, which contains 22 as substring.

It is a D-number.

73221 is a lucky number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 73221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12201 + ... + 12206.

It is an arithmetic number, because the mean of its divisors is an integer number (24408).

2⁷³²²¹ is an apocalyptic number.

It is an amenable number.

73221 is a deficient number, since it is larger than the sum of its proper divisors (24411).

73221 is a wasteful number, since it uses less digits than its factorization.

73221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24410.

The product of its digits is 84, while the sum is 15.

The square root of 73221 is about 270.5937915031. The cubic root of 73221 is about 41.8355245418.

Subtracting from 73221 its product of digits (84), we obtain a palindrome (73137).

Adding to 73221 its reverse (12237), we get a palindrome (85458).

The spelling of 73221 in words is "seventy-three thousand, two hundred twenty-one", and thus it is an iban number.