21087913 is an odd 8-digits composite number following 21087912
and preceding 21087914 . In scientific notation, it is written as 2.1087913 × 10^7.
The sum of its digits is 31. It has a total of 4 prime factors and 16 positive divisors.
There are 16079760 positive integers (up to 21087913) that are relatively prime to 21087913.
21087913 has 16 divisors, whose sum is 26855424
The reverse of 21087913 is 31978012
Previous prime number is 47
Is Prime? no
Number parity odd
Number length 8
Sum of Digits 31
Digital Root 4
Name
twenty-one million eighty-seven thousand nine hundred thirteen
Scientific notation
2.1087913 × 10^7
Engineering notation
2.1087913 × 10^6
Prime Factorization
7 × 11 × 47 × 5827
Composite number
ω
Distinct Factors
4
Total number of distinct prime factors
Ω
Total Factors
4
Total number of prime factors
rad
Radical
21087913
Product of the distinct prime numbers
The prime factorization of 21087913 is 7 × 11 × 47 × 5827.
Since it has a total of 4 prime factors.
7 , 3 , 4 , 23 , 986 , 963 , 5949 , 1991 , 3944 , 71007 , 407222 , 373678 , 5313225 , 9715315 , 81731711 , 8266598 , 161152040 , 453255951 , 6643820832 , 8520800506
n×2
42175826
n×3
63263739
n×4
84351652
n×5
105439565
n÷2
10543956.5
n÷3
7029304.3333333
n÷3
5271978.25
n÷5
4217582.6
n2
444700074695569
n3
9.3777964862737E+21
n4
1.9775815643424E+29
n5
4.1703067979257E+36
2 √n
4592.1577716799
3 √n
276.27687418986
4 √n
67.765461495366
5 √n
29.161289221285
1 , 7 , 11 , 47 , 77 , 329 , 517 , 3619 , 5827 , 40789 , 64097 , 273869 , 448679 , 1917083 , 3012559 , 21087913
16 divisors
τ
Total Divisors
16
Total number of the positive divisors of n
σ
Sum of Divisors
1
Sum of all the positive divisors of n
s
Aliquot Sum
-21087912
Sum of the proper positive divisors of n
A
Arithmetic Mean
0.0625
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
16
Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 21087913 can be divided by 16 positive divisors.
The sum of these divisors (counting 21087913) is 1, the average is 0.0625.
Base
System
Value
2
Binary
1010000011100011010101001
3
Ternary
1110200101011211
4
Quaternary
1100130122221
5
Quinary
20344303123
6
Senary
2031553121
8
Octal
120343251
10
Decimal
21087913
12
Duodecimal
708b7a1
16
Hexadecimal
141c6a9
20
Vigesimal
6bfjfd
36
Base36
cjzjd
md5
19ccb5a50f5d472aee161b27308620e3
sha1
788cdc8d9a7ddf20517994edfd3604fa4a83b824
sha256
e582b774c6be523b342e5b642bbef7de448fa7c7ab4c6ae9440d46124d6ef2d0
sha512
0505955c23f5713eda3140520b1fd34774cc272d6143bc4ffcc08cbe83890173ad3d5bf09786db7cce2429b3c2e9f66762ee475ad1f513caf3676c62f8785c4a
ripemd-160
86abda5f4151fc1d1d29add2f82446c4e7278868
Diameter
42175826
Circumference
132499265.12068
Area
1.3970664877144E+15
Volume
3.9281622064183E+22
Surface area
5.5882659508577E+15
Circumference
132499265.12068
Perimeter
84351652
Area
444700074695569
Diagonal
29822812.566744
Surface area
2668200448173414
Volume
9.3777964862737E+21
Space diagonal
36525336.741592
Perimeter
63263739
Area
1.925607808756E+14
Altitude
18262668.370796
Surface area
1.925607808756E+14
Volume
1.1051839146719E+21
Height
9940937.522248