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21059 is a prime number
BaseRepresentation
bin101001001000011
31001212222
411021003
51133214
6241255
7115253
oct51103
931788
1021059
1114905
121022b
13977c
147963
15638e
hex5243

21059 has 2 divisors, whose sum is σ = 21060. Its totient is φ = 21058.

The previous prime is 21031. The next prime is 21061. The reversal of 21059 is 95012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21059 - 212 = 16963 is a prime.

Together with 21061, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21059.

It is not a weakly prime, because it can be changed into another prime (21019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529 + 10530.

It is an arithmetic number, because the mean of its divisors is an integer number (10530).

221059 is an apocalyptic number.

21059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21059 is an equidigital number, since it uses as much as digits as its factorization.

21059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 21059 is about 145.1171940192. The cubic root of 21059 is about 27.6150551483.

The spelling of 21059 in words is "twenty-one thousand, fifty-nine".