169221 has 8 divisors (see below), whose sum is σ = 243040. Its totient is φ = 104112.

The previous prime is 169219. The next prime is 169241. The reversal of 169221 is 122961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 169221 - 2¹ = 169219 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169241) 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 7 ways as a sum of consecutive naturals, for example, 2131 + ... + 2208.

It is an arithmetic number, because the mean of its divisors is an integer number (30380).

2¹⁶⁹²²¹ is an apocalyptic number.

It is an amenable number.

169221 is a deficient number, since it is larger than the sum of its proper divisors (73819).

169221 is a wasteful number, since it uses less digits than its factorization.

169221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355.

The product of its digits is 216, while the sum is 21.

The square root of 169221 is about 411.3648016056. The cubic root of 169221 is about 55.3118374270.

The spelling of 169221 in words is "one hundred sixty-nine thousand, two hundred twenty-one".