221 is an odd 3-digits composite number following 220
and preceding 222 . In scientific notation, it is written as 2.21 × 10^2.
The sum of its digits is 5. It has a total of 2 prime factors and 4 positive divisors.
There are 192 positive integers (up to 221) that are relatively prime to 221.
221 has 4 divisors, whose sum is 252
The reverse of 221 is 122
Previous prime number is 13
Is Prime? no
Number parity odd
Number length 3
Sum of Digits 5
Digital Root 5
Name
two hundred twenty-one
Scientific notation
2.21 × 10^2
Engineering notation
2.21 × 10^0
Prime Factorization
13 × 17
Composite number
ω
Distinct Factors
2
Total number of distinct prime factors
Ω
Total Factors
2
Total number of prime factors
rad
Radical
221
Product of the distinct prime numbers
The prime factorization of 221 is 13 × 17.
Since it has a total of 2 prime factors.
4 , 9 , 4 , 38 , 315 , 477 , 6591 , 2982 , 50622 , 80123 , 894864 , 507743 , 575503 , 47358 , 15587266 , 57227280 , 664388970 , 991729698 , 9718601072 , 6638845546
n×2
442
n×3
663
n×4
884
n×5
1105
n÷2
110.5
n÷3
73.666666666667
n÷3
55.25
n÷5
44.2
n2
48841
n3
10793861
n4
2385443281
n5
527182965101
2 √n
14.866068747319
3 √n
6.0459435960125
4 √n
3.8556541270345
5 √n
2.9435976987923
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
-220
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 221 can be divided by 4 positive divisors.
The sum of these divisors (counting 221) is 1, the average is 0.25.
Base
System
Value
2
Binary
11011101
3
Ternary
22012
4
Quaternary
3131
5
Quinary
1341
6
Senary
1005
8
Octal
335
10
Decimal
221
12
Duodecimal
165
16
Hexadecimal
dd
20
Vigesimal
b1
36
Base36
65
md5
060ad92489947d410d897474079c1477
sha1
9a70776c743352cfcf688e52512673332e5e4007
sha256
67e9c3acebb154a282f326d4ff1951cd1f342e58e74d562b556b517da5e56132
sha512
cc9aab6fee3af4f819209bf43e3bc6f8f02ecbf5d2f27815b9a2132d3dbbfe9ba72d6024794487c37affbc6828040ed74d3d2671bb962b44c95f9070d4e2db48
ripemd-160
4bdbd27cd6cb798409a7ad89cf68977ec5a77cdf
Diameter
442
Circumference
1388.5839528867
Area
153438.52679398
Volume
45213219.228626
Surface area
613754.10717592
Circumference
1388.5839528867
Perimeter
884
Area
48841
Diagonal
312.54119728445
Surface area
293046
Volume
10793861
Space diagonal
382.78322847272
Perimeter
663
Area
21148.773373118
Altitude
191.39161423636
Surface area
21148.773373118
Volume
1272068.7180475
Height
104.18039909482