167221 has 2 divisors, whose sum is σ = 167222. Its totient is φ = 167220.

The previous prime is 167213. The next prime is 167249. The reversal of 167221 is 122761.

167221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148996 + 18225 = 386^2 + 135^2 .

It is an emirp because it is prime and its reverse (122761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 167221 - 2³ = 167213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83610 + 83611.

It is an arithmetic number, because the mean of its divisors is an integer number (83611).

2¹⁶⁷²²¹ is an apocalyptic number.

It is an amenable number.

167221 is a deficient number, since it is larger than the sum of its proper divisors (1).

167221 is an equidigital number, since it uses as much as digits as its factorization.

167221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 19.

The square root of 167221 is about 408.9266437883. The cubic root of 167221 is about 55.0930655753.

Adding to 167221 its reverse (122761), we get a palindrome (289982).

The spelling of 167221 in words is "one hundred sixty-seven thousand, two hundred twenty-one".