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BaseRepresentation
bin101001100101111
31002012201
411030233
51140140
6242331
7116041
oct51457
932181
1021295
1114aaa
12103a7
139901
147a91
15649a
hex532f

21295 has 4 divisors (see below), whose sum is σ = 25560. Its totient is φ = 17032.

The previous prime is 21283. The next prime is 21313. The reversal of 21295 is 59212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21295 - 213 = 13103 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125 + ... + 2134.

It is an arithmetic number, because the mean of its divisors is an integer number (6390).

221295 is an apocalyptic number.

21295 is a deficient number, since it is larger than the sum of its proper divisors (4265).

21295 is an equidigital number, since it uses as much as digits as its factorization.

21295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264.

The product of its digits is 180, while the sum is 19.

The square root of 21295 is about 145.9280644701. The cubic root of 21295 is about 27.7178292338.

Subtracting from 21295 its product of digits (180), we obtain a triangular number (21115 = T205).

The spelling of 21295 in words is "twenty-one thousand, two hundred ninety-five".

Divisors: 1 5 4259 21295