221173 has 2 divisors, whose sum is σ = 221174.
Its totient is φ = 221172.
The previous prime is 221171. The next prime is 221197. The reversal of 221173 is 371122.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 114244 + 106929 = 338^2 + 327^2
It is a cyclic number.
It is not a de Polignac number, because 221173 - 21 = 221171 is a prime.
Together with 221171, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (221171) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110586 + 110587.
It is an arithmetic number, because the mean of its divisors is an integer number (110587).
2221173 is an apocalyptic number.
It is an amenable number.
221173 is a deficient number, since it is larger than the sum of its proper divisors (1).
221173 is an equidigital number, since it uses as much as digits as its factorization.
221173 is an evil number, because the sum of its binary digits is even.
The product of its digits is 84, while the sum is 16.
The square root of 221173 is about 470.2903358565.
The cubic root of 221173 is about 60.4752078370.
Adding to 221173 its reverse (371122), we get a palindrome (592295).
The spelling of 221173 in words is "two hundred twenty-one thousand, one hundred seventy-three", and thus it is an iban number.