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BaseRepresentation
bin101001011110011
31002010111
411023303
51134420
6242151
7115624
oct51363
932114
1021235
1114a55
1210357
139886
147a4b
15645a
hex52f3

21235 has 8 divisors (see below), whose sum is σ = 26496. Its totient is φ = 16320.

The previous prime is 21227. The next prime is 21247. The reversal of 21235 is 53212.

Adding to 21235 its reverse (53212), we get a palindrome (74447).

It can be divided in two parts, 21 and 235, that added together give a 8-th power (256 = 28).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21235 - 23 = 21227 is a prime.

It is a d-powerful number, because it can be written as 212 + 1 + 214 + 36 + 52 .

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87 + ... + 223.

It is an arithmetic number, because the mean of its divisors is an integer number (3312).

221235 is an apocalyptic number.

21235 is a deficient number, since it is larger than the sum of its proper divisors (5261).

21235 is a wasteful number, since it uses less digits than its factorization.

21235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173.

The product of its digits is 60, while the sum is 13.

The square root of 21235 is about 145.7223387130. The cubic root of 21235 is about 27.6917725047.

The spelling of 21235 in words is "twenty-one thousand, two hundred thirty-five".

Divisors: 1 5 31 137 155 685 4247 21235