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21051 = 322339
BaseRepresentation
bin101001000111011
31001212200
411020323
51133201
6241243
7115242
oct51073
931780
1021051
11148a8
1210223
139774
147959
156386
hex523b

21051 has 6 divisors (see below), whose sum is σ = 30420. Its totient is φ = 14028.

The previous prime is 21031. The next prime is 21059. The reversal of 21051 is 15012.

It is a happy number.

21051 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21051 - 25 = 21019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2339 = 21051 / (2 + 1 + 0 + 5 + 1).

21051 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (5070).

221051 is an apocalyptic number.

21051 is a deficient number, since it is larger than the sum of its proper divisors (9369).

21051 is a wasteful number, since it uses less digits than its factorization.

21051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345 (or 2342 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 21051 is about 145.0896274721. The cubic root of 21051 is about 27.6115578562.

Adding to 21051 its reverse (15012), we get a palindrome (36063).

The spelling of 21051 in words is "twenty-one thousand, fifty-one".

Divisors: 1 3 9 2339 7017 21051