221171 has 2 divisors, whose sum is σ = 221172. Its totient is φ = 221170.
The previous prime is 221159. The next prime is 221173. The reversal of 221171 is 171122.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 221171 - 210 = 220147 is a prime.
It is a super-2 number, since 2×2211712 = 97833222482, which contains 22 as substring.
Together with 221173, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (221173) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110585 + 110586.
It is an arithmetic number, because the mean of its divisors is an integer number (110586).
2221171 is an apocalyptic number.
221171 is a deficient number, since it is larger than the sum of its proper divisors (1).
221171 is an equidigital number, since it uses as much as digits as its factorization.
221171 is an evil number, because the sum of its binary digits is even.
The product of its digits is 28, while the sum is 14.
The square root of 221171 is about 470.2882095056. The cubic root of 221171 is about 60.4750255502.
Adding to 221171 its reverse (171122), we get a palindrome (392293).
The spelling of 221171 in words is "two hundred twenty-one thousand, one hundred seventy-one", and thus it is an iban number.
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