84221 has 2 divisors, whose sum is σ = 84222. Its totient is φ = 84220.
The previous prime is 84211. The next prime is 84223. The reversal of 84221 is 12248.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 84100 + 121 = 290^2 + 11^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-84221 is a prime.
Together with 84223, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 14.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 84221.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (84223) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42110 + 42111.
It is an arithmetic number, because the mean of its divisors is an integer number (42111).
284221 is an apocalyptic number.
It is an amenable number.
84221 is a deficient number, since it is larger than the sum of its proper divisors (1).
84221 is an equidigital number, since it uses as much as digits as its factorization.
84221 is an evil number, because the sum of its binary digits is even.
The product of its digits is 128, while the sum is 17.
The square root of 84221 is about 290.2085457046. The cubic root of 84221 is about 43.8335654528.
Adding to 84221 its reverse (12248), we get a palindrome (96469).
The spelling of 84221 in words is "eighty-four thousand, two hundred twenty-one".
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