21391 (number)

21391 is an odd 5-digits prime number following 21390 and preceding 21392. In scientific notation, it is written as 2.1391 × 10^4. The sum of its digits is 16. It has a total of 1 prime factors and 2 positive divisors. There are 21390 positive integers (up to 21391) that are relatively prime to 21391.

Interesting facts

Basic properties

Name

Name twenty-one thousand three hundred ninety-one

Notation

Scientific notation 2.1391 × 10^4
Engineering notation 2.1391 × 10^3

Prime Factorization of 21391

Prime Factorization 21391

Composite number
ω Distinct Factors 1
Total number of distinct prime factors
Ω Total Factors 1
Total number of prime factors
rad Radical 21391
Product of the distinct prime numbers

The prime factorization of 21391 is 21391. Since it has a total of 1 prime factors.

Most popular turbo-numbers

5, 3, 56, 52, 435, 61, 9928, 7598, 30444, 54554, 258499, 552993, 4073906, 3851960, 32183542, 96130009, 467003127, 390694748, 4981376151, 7335439620

Basic calculations (n = 21391)

Multiplication

n×y
n×2 42782
n×3 64173
n×4 85564
n×5 106955

Division

n÷y
n÷2 10695.5
n÷3 7130.3333333333
n÷3 5347.75
n÷5 4278.2

Exponentiation

ny
n2 457574881
n3 9787984279471
n4 209374771722164161
n5 4.4787357419088E+21

Nth Root

y√n
2√n 146.25662378163
3√n 27.759418386771
4√n 12.093660479012
5√n 7.3459203915567

Divisors of 21391

1, 21391

2 divisors

τ Total Divisors 2
Total number of the positive divisors of n
σ Sum of Divisors 21392
Sum of all the positive divisors of n
s Aliquot Sum 1
Sum of the proper positive divisors of n
A Arithmetic Mean 10696
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 146.26004239026
Returns the nth root of the product of n divisors
H Harmonic Mean 1.9999065071055
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 21391 can be divided by 2 positive divisors. The sum of these divisors (counting 21391) is 21392, the average is 10696.

Base conversion 21391

Base System Value
2 Binary 101001110001111
3 Ternary 1002100021
4 Quaternary 11032033
5 Quinary 1141031
6 Senary 243011
8 Octal 51617
10 Decimal 21391
12 Duodecimal 10467
16 Hexadecimal 538f
20 Vigesimal 2d9b
36 Base36 gi7

Cryptographic Hash Functions

md5 109ac6c7e70ef69fcbf717f86c278ed1
sha1 1a802a84a582fe5ee1cd7d11868c7a26af30e62c
sha256 4560b0a818ab41c47eb9cfdb900203fde2c6d82e82c1c388679c376d746d3535
sha512 da3ce91f37e78032c2b78bea669d3e77d02742d809a9b5738bd17d844db9a16d40e1013c3236d1bebee18a25d74a9355030b02ab4cc6ef9bf77d4aed32b02b92
ripemd-160 ba50714c9d79c9e0cca63506a20104df04657a85

21391 as geometric shapes

Circle

Radius = n
Diameter 42782
Circumference 134403.61690588
Area 1437513884.6168

Sphere

Radius = n
Volume 40999812674451
Surface area 5750055538.4673
Circumference 134403.61690588

Square

Length = n
Perimeter 85564
Area 457574881
Diagonal 30251.442312723

Cube

Length = n
Surface area 2745449286
Volume 9787984279471
Space diagonal 37050.298824706

Equilateral Triangle

Length = n
Perimeter 64173
Area 198135735.53982
Altitude 18525.149412353

Triangular Pyramid

Length = n
Surface area 198135735.53982
Volume 1153525009693.5
Height 10083.814104241