168221 has 4 divisors (see below), whose sum is σ = 169500. Its totient is φ = 166944.

The previous prime is 168211. The next prime is 168227. The reversal of 168221 is 122861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16900 + 151321 = 130^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 168221 - 2¹⁰ = 167197 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 168193 and 168202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168227) 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, 416 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (42375).

2¹⁶⁸²²¹ is an apocalyptic number.

It is an amenable number.

168221 is a deficient number, since it is larger than the sum of its proper divisors (1279).

168221 is a wasteful number, since it uses less digits than its factorization.

168221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its digits is 192, while the sum is 20.

The square root of 168221 is about 410.1475344312. The cubic root of 168221 is about 55.2026682530.

It can be divided in two parts, 168 and 221, that multiplied together give a triangular number (37128 = T₂₇₂).

The spelling of 168221 in words is "one hundred sixty-eight thousand, two hundred twenty-one".