79221 has 4 divisors (see below), whose sum is σ = 105632. Its totient is φ = 52812.

The previous prime is 79201. The next prime is 79229. The reversal of 79221 is 12297.

It is a happy number.

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: 12297 = 3 ⋅4099.

It is a de Polignac number, because none of the positive numbers 2^k-79221 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

79221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79229) 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, 13201 + ... + 13206.

It is an arithmetic number, because the mean of its divisors is an integer number (26408).

2⁷⁹²²¹ is an apocalyptic number.

It is an amenable number.

79221 is a deficient number, since it is larger than the sum of its proper divisors (26411).

79221 is a wasteful number, since it uses less digits than its factorization.

79221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26410.

The product of its digits is 252, while the sum is 21.

The square root of 79221 is about 281.4622532419. The cubic root of 79221 is about 42.9483786521.

It can be divided in two parts, 79 and 221, that added together give a triangular number (300 = T₂₄).

The spelling of 79221 in words is "seventy-nine thousand, two hundred twenty-one".