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82421 is a prime number
BaseRepresentation
bin10100000111110101
311012001122
4110013311
510114141
61433325
7462203
oct240765
9135048
1082421
1156a19
123b845
132b691
1422073
151964b
hex141f5

82421 has 2 divisors, whose sum is σ = 82422. Its totient is φ = 82420.

The previous prime is 82393. The next prime is 82457. The reversal of 82421 is 12428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81796 + 625 = 286^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 82421 - 214 = 66037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41210 + 41211.

It is an arithmetic number, because the mean of its divisors is an integer number (41211).

282421 is an apocalyptic number.

It is an amenable number.

82421 is a deficient number, since it is larger than the sum of its proper divisors (1).

82421 is an equidigital number, since it uses as much as digits as its factorization.

82421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 17.

The square root of 82421 is about 287.0905780411. The cubic root of 82421 is about 43.5190386560.

Adding to 82421 its reverse (12428), we get a palindrome (94849).

The spelling of 82421 in words is "eighty-two thousand, four hundred twenty-one".