21811 (number)

21811 is an odd 5-digits composite number following 21810 and preceding 21812. In scientific notation, it is written as 2.1811 × 10^4. The sum of its digits is 13. It has a total of 2 prime factors and 4 positive divisors. There are 20512 positive integers (up to 21811) that are relatively prime to 21811.

Interesting facts

Basic properties

Name

Name twenty-one thousand eight hundred eleven

Notation

Scientific notation 2.1811 × 10^4
Engineering notation 2.1811 × 10^3

Prime Factorization of 21811

Prime Factorization 17 × 1283

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 21811
Product of the distinct prime numbers

The prime factorization of 21811 is 17 × 1283. Since it has a total of 2 prime factors.

Most popular turbo-numbers

8, 3, 61, 64, 377, 989, 6154, 8617, 18223, 26993, 855112, 399091, 9399591, 3175965, 79159285, 25345083, 58061900, 388227717, 7235507742, 258252544

Basic calculations (n = 21811)

Multiplication

n×y
n×2 43622
n×3 65433
n×4 87244
n×5 109055

Division

n÷y
n÷2 10905.5
n÷3 7270.3333333333
n÷3 5452.75
n÷5 4362.2

Exponentiation

ny
n2 475719721
n3 10375922834731
n4 226309252948317841
n5 4.9360311160558E+21

Nth Root

y√n
2√n 147.68547660484
3√n 27.939922207562
4√n 12.152591353487
5√n 7.3745430555315

Divisors of 21811

1, 17, 1283, 21811

4 divisors

τ Total Divisors 4
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -21810
Sum of the proper positive divisors of n
A Arithmetic Mean 0.25
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 1
Returns the nth root of the product of n divisors
H Harmonic Mean 4
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 21811 can be divided by 4 positive divisors. The sum of these divisors (counting 21811) is 1, the average is 0.25.

Base conversion 21811

Base System Value
2 Binary 101010100110011
3 Ternary 1002220211
4 Quaternary 11110303
5 Quinary 1144221
6 Senary 244551
8 Octal 52463
10 Decimal 21811
12 Duodecimal 10757
16 Hexadecimal 5533
20 Vigesimal 2eab
36 Base36 gtv

Cryptographic Hash Functions

md5 7d3c93b7a874ca3a2fd63f325225b26b
sha1 bec4518c77d5cb88fa58d1b0778823882277d067
sha256 ef0fea2d41c920cd790dd5a067fd14deccdb9c39c432cb38a6895ec705da9e70
sha512 b7530bf62aecaed516af3be6d77f8aa22b0f99dc579216db251c02305dc1bf55c321857850db4dd6916e3f9e04c93f6e9bba928804efd626778cbbc05422f1f0
ripemd-160 ebb563ac412e64d0a266b894ebcdd0ffaa01be9b

21811 as geometric shapes

Circle

Radius = n
Diameter 43622
Circumference 137042.55473489
Area 1494517580.6614

Sphere

Radius = n
Volume 43462563935741
Surface area 5978070322.6455
Circumference 137042.55473489

Square

Length = n
Perimeter 87244
Area 475719721
Diagonal 30845.41200892

Cube

Length = n
Surface area 2854318326
Volume 10375922834731
Space diagonal 37777.760163885

Equilateral Triangle

Length = n
Perimeter 65433
Area 205992681.73362
Altitude 18888.880081942

Triangular Pyramid

Length = n
Surface area 205992681.73362
Volume 1222814232917.8
Height 10281.804002973