21581 (number)

21581 is an odd 5-digits composite number following 21580 and preceding 21582. In scientific notation, it is written as 2.1581 × 10^4. The sum of its digits is 17. It has a total of 2 prime factors and 4 positive divisors. There are 18492 positive integers (up to 21581) that are relatively prime to 21581.

Interesting facts

Basic properties

Name

Name twenty-one thousand five hundred eighty-one

Notation

Scientific notation 2.1581 × 10^4
Engineering notation 2.1581 × 10^3

Prime Factorization of 21581

Prime Factorization 7 × 3083

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 21581
Product of the distinct prime numbers

The prime factorization of 21581 is 7 × 3083. Since it has a total of 2 prime factors.

Most popular turbo-numbers

6, 9, 25, 66, 650, 523, 2039, 2405, 26366, 90055, 748657, 929281, 6835065, 9003399, 43878398, 81064782, 364933948, 923048445, 1887465577, 593441170

Basic calculations (n = 21581)

Multiplication

n×y
n×2 43162
n×3 64743
n×4 86324
n×5 107905

Division

n÷y
n÷2 10790.5
n÷3 7193.6666666667
n÷3 5395.25
n÷5 4316.2

Exponentiation

ny
n2 465739561
n3 10051125465941
n4 216913338680472721
n5 4.6812067620633E+21

Nth Root

y√n
2√n 146.90473103341
3√n 27.841364848092
4√n 12.120426190255
5√n 7.3589239189584

Divisors of 21581

1, 7, 3083, 21581

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 -21580
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 21581 can be divided by 4 positive divisors. The sum of these divisors (counting 21581) is 1, the average is 0.25.

Base conversion 21581

Base System Value
2 Binary 101010001001101
3 Ternary 1002121022
4 Quaternary 11101031
5 Quinary 1142311
6 Senary 243525
8 Octal 52115
10 Decimal 21581
12 Duodecimal 105a5
16 Hexadecimal 544d
20 Vigesimal 2dj1
36 Base36 gnh

Cryptographic Hash Functions

md5 5fd28676525f025716fa72429d241209
sha1 219bd461f04f21f61eb2c8f86f7887f0feaaa8a3
sha256 61c554af9e427e2048ba3405c62b1d8aac2e1e8e08febde6df7a36f90baa6782
sha512 be78864780a7aa81d14cd1fff61d9c6a6e6cce02eea2d7795b9a82f18b1ef903cbc24f151144b5c25dbc5b7f663cb1b29cd50a9277f480a94dd56085b05e70e8
ripemd-160 a6a62703a77f06293daf11b8aa1f4cb0977f2af6

21581 as geometric shapes

Circle

Radius = n
Diameter 43162
Circumference 135597.42211424
Area 1463163983.3237

Sphere

Radius = n
Volume 42102055898813
Surface area 5852655933.2949
Circumference 135597.42211424

Square

Length = n
Perimeter 86324
Area 465739561
Diagonal 30520.142889574

Cube

Length = n
Surface area 2794437366
Volume 10051125465941
Space diagonal 37379.388478144

Equilateral Triangle

Length = n
Perimeter 64743
Area 201671145.68671
Altitude 18689.694239072

Triangular Pyramid

Length = n
Surface area 201671145.68671
Volume 1184536495920.6
Height 10173.380963191