21821981 is an odd 8-digits prime number following 21821980
and preceding 21821982 . In scientific notation, it is written as 2.1821981 × 10^7.
The sum of its digits is 32. It has a total of 1 prime factors and 2 positive divisors.
There are 21821980 positive integers (up to 21821981) that are relatively prime to 21821981.
21821981 has 2 divisors, whose sum is 21821982
The reverse of 21821981 is 18912812
Previous prime number is 1
Is Prime? yes Number parity odd Number length 8 Sum of Digits 32 Digital Root 5
Name
twenty-one million eight hundred twenty-one thousand nine hundred eighty-one
Scientific notation
2.1821981 × 10^7
Engineering notation
2.1821981 × 10^6
Prime Factorization
21821981
Composite number
ω Distinct Factors
1 Total number of distinct prime factors
Ω Total Factors
1 Total number of prime factors
rad Radical
21821981 Product of the distinct prime numbers
The prime factorization of 21821981 is 21821981.
Since it has a total of 1 prime factors.
2 , 8 , 17 , 99 , 682 , 269 , 4949 , 2661 , 75675 , 69468 , 407770 , 374589 , 4282557 , 2421832 , 31713421 , 29721398 , 613101421 , 129481498 , 2709081639 , 6429568280
n×2
43643962
n×3
65465943
n×4
87287924
n×5
109109905
n÷2
10910990.5
n÷3
7273993.6666667
n÷3
5455495.25
n÷5
4364396.2
n2
476198854764361
n3
1.039160236089E+22
n4
2.2676534927889E+29
n5
4.9484691434223E+36
2 √n4671.4003253842
3 √n279.44610313127
4 √n68.347643158958
5 √n29.361540288223
2 divisors
τ Total Divisors
2 Total number of the positive divisors of n
σ Sum of Divisors
21821982 Sum of all the positive divisors of n
s Aliquot Sum
1 Sum of the proper positive divisors of n
A Arithmetic Mean
10910991 Returns the sum of divisors (σ(n )) divided by the total number of divisors (τ(n ))
G Geometric Mean
4671.4004324185 Returns the nth root of the product of n divisors
H Harmonic Mean
1.9999999083493 Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 21821981 can be divided by 2 positive divisors.
The sum of these divisors (counting 21821981) is 21821982, the average is 10910991.
Base
System
Value
2
Binary
1010011001111101000011101
3
Ternary
1112001200010112
4
Quaternary
1103033220131
5
Quinary
21041300411
6
Senary
2055415405
8
Octal
123175035
10
Decimal
21821981
12
Duodecimal
7384565
16
Hexadecimal
14cfa1d
20
Vigesimal
6g7ej1
36
Base36
czpy5
md5
89f10cf030a9f30c16892e26a6f84c21
sha1
2ec697c3a1e27577a354902ccfa5947f491eb4c9
sha256
bbde85c8054931a42f925f0a46bd99776d8abbff2e4713d75bddd6a832098350
sha512
dd8d62985af1c1ba0f61afc496cd7b3a83c5604567391d6407766d2fa0a4b3c7b9788544334e908d248aa156748484e811cc778412471cf10b8b214f16d26872
ripemd-160
93fadfde601440c84d6091dcc6eb571e584c4fbe
Diameter
43643962
Circumference
137111550.39275
Area
1.4960228237756E+15
Volume
4.352824218133E+22
Surface area
5.9840912951024E+15
Circumference
137111550.39275
Perimeter
87287924
Area
476198854764361
Diagonal
30860941.488048
Surface area
2857193128586166
Volume
1.039160236089E+22
Space diagonal
37796779.813803
Perimeter
65465943
Area
2.062001527395E+14
Altitude
18898389.906901
Surface area
2.062001527395E+14
Volume
1.2246620827965E+21
Height
10286980.496016