68221 has 4 divisors (see below), whose sum is σ = 72252. Its totient is φ = 64192.

The previous prime is 68219. The next prime is 68227. The reversal of 68221 is 12286.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12286 = 2 ⋅6143.

It can be written as a sum of positive squares in 2 ways, for example, as 55225 + 12996 = 235^2 + 114^2 .

It is not a de Polignac number, because 68221 - 2¹ = 68219 is a prime.

It is a Duffinian number.

68221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68227) 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, 1990 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (18063).

2⁶⁸²²¹ is an apocalyptic number.

It is an amenable number.

68221 is a deficient number, since it is larger than the sum of its proper divisors (4031).

68221 is a wasteful number, since it uses less digits than its factorization.

68221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030.

The product of its digits is 192, while the sum is 19.

The square root of 68221 is about 261.1915006274. The cubic root of 68221 is about 40.8607211330.

It can be divided in two parts, 682 and 21, that added together give a triangular number (703 = T₃₇).

The spelling of 68221 in words is "sixty-eight thousand, two hundred twenty-one".