21815 (number)

21815 is an odd 5-digits composite number following 21814 and preceding 21816. In scientific notation, it is written as 2.1815 × 10^4. The sum of its digits is 17. It has a total of 2 prime factors and 4 positive divisors. There are 17448 positive integers (up to 21815) that are relatively prime to 21815.

Interesting facts

Basic properties

Name

Name twenty-one thousand eight hundred fifteen

Notation

Scientific notation 2.1815 × 10^4
Engineering notation 2.1815 × 10^3

Prime Factorization of 21815

Prime Factorization 5 × 4363

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 21815
Product of the distinct prime numbers

The prime factorization of 21815 is 5 × 4363. Since it has a total of 2 prime factors.

Most popular turbo-numbers

2, 8, 14, 37, 46, 693, 4186, 428, 24694, 42762, 348106, 184487, 5068374, 5075588, 88031656, 90466596, 465423038, 140541980, 691914228, 7726720025

Basic calculations (n = 21815)

Multiplication

n×y
n×2 43630
n×3 65445
n×4 87260
n×5 109075

Division

n÷y
n÷2 10907.5
n÷3 7271.6666666667
n÷3 5453.75
n÷5 4363

Exponentiation

ny
n2 475894225
n3 10381632518375
n4 226475313388350625
n5 4.9405589615669E+21

Nth Root

y√n
2√n 147.69901827704
3√n 27.941630105068
4√n 12.153148492347
5√n 7.3748135246393

Divisors of 21815

1, 5, 4363, 21815

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 -21814
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 21815 can be divided by 4 positive divisors. The sum of these divisors (counting 21815) is 1, the average is 0.25.

Base conversion 21815

Base System Value
2 Binary 101010100110111
3 Ternary 1002220222
4 Quaternary 11110313
5 Quinary 1144230
6 Senary 244555
8 Octal 52467
10 Decimal 21815
12 Duodecimal 1075b
16 Hexadecimal 5537
20 Vigesimal 2eaf
36 Base36 gtz

Cryptographic Hash Functions

md5 618d8cb4eae98f783b4285e692e91d38
sha1 93d8a633d81ccb4dfd5409a6e12c7ddb0bc28626
sha256 98076d74607212f062bcc035ad929b73d849e97aed2ea1cb4b7934dd5174e711
sha512 1bebb2b8d179592ae3dfba4d1497a0820916eb462cbaaced9b40da4d508eaf0a09648bc6848bfedc7ac77c2384d3e0da7b1f80c5fbf340398aa15577529f00c0
ripemd-160 7405212492d999cfc88e174df07ecf6d8305d2e7

21815 as geometric shapes

Circle

Radius = n
Diameter 43630
Circumference 137067.68747612
Area 1495065801.1458

Sphere

Radius = n
Volume 43486480602661
Surface area 5980263204.5832
Circumference 137067.68747612

Square

Length = n
Perimeter 87260
Area 475894225
Diagonal 30851.068863169

Cube

Length = n
Surface area 2855365350
Volume 10381632518375
Space diagonal 37784.688367115

Equilateral Triangle

Length = n
Perimeter 65445
Area 206068244.18215
Altitude 18892.344183558

Triangular Pyramid

Length = n
Surface area 206068244.18215
Volume 1223487125588.3
Height 10283.689621056