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21710 = 2513167
BaseRepresentation
bin101010011001110
31002210002
411103032
51143320
6244302
7120203
oct52316
932702
1021710
1115347
1210692
139b60
147caa
156675
hex54ce

21710 has 16 divisors (see below), whose sum is σ = 42336. Its totient is φ = 7968.

The previous prime is 21701. The next prime is 21713. The reversal of 21710 is 1712.

It is a junction number, because it is equal to n+sod(n) for n = 21691 and 21700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713) by changing a digit.

21710 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47 + ... + 213.

It is an arithmetic number, because the mean of its divisors is an integer number (2646).

221710 is an apocalyptic number.

21710 is a deficient number, since it is larger than the sum of its proper divisors (20626).

21710 is a wasteful number, since it uses less digits than its factorization.

21710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 21710 is about 147.3431369287. The cubic root of 21710 is about 27.8967284183.

The spelling of 21710 in words is "twenty-one thousand, seven hundred ten", and thus it is an iban number.

Divisors: 1 2 5 10 13 26 65 130 167 334 835 1670 2171 4342 10855 21710