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84421 is a prime number
BaseRepresentation
bin10100100111000101
311021210201
4110213011
510200141
61450501
7501061
oct244705
9137721
1084421
1158477
1240a31
132c56c
1422aa1
151a031
hex149c5

84421 has 2 divisors, whose sum is σ = 84422. Its totient is φ = 84420.

The previous prime is 84407. The next prime is 84431. The reversal of 84421 is 12448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521 + 900 = 289^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 84421 - 25 = 84389 is a prime.

84421 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42210 + 42211.

It is an arithmetic number, because the mean of its divisors is an integer number (42211).

284421 is an apocalyptic number.

It is an amenable number.

84421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84421 is an equidigital number, since it uses as much as digits as its factorization.

84421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 19.

The square root of 84421 is about 290.5529211693. The cubic root of 84421 is about 43.8682352809.

Adding to 84421 its reverse (12448), we get a palindrome (96869).

It can be divided in two parts, 84 and 421, that added together give a palindrome (505).

The spelling of 84421 in words is "eighty-four thousand, four hundred twenty-one".