21397981 (number)

21397981 is an odd 8-digits composite number following 21397980 and preceding 21397982. In scientific notation, it is written as 2.1397981 × 10^7. The sum of its digits is 40. It has a total of 4 prime factors and 16 positive divisors. There are 18364720 positive integers (up to 21397981) that are relatively prime to 21397981.

Interesting facts

Basic properties

Name

Name twenty-one million three hundred ninety-seven thousand nine hundred eighty-one

Notation

Scientific notation 2.1397981 × 10^7
Engineering notation 2.1397981 × 10^6

Prime Factorization of 21397981

Prime Factorization 23 × 11 × 83 × 1019

Composite number
ω Distinct Factors 4
Total number of distinct prime factors
Ω Total Factors 4
Total number of prime factors
rad Radical 21397981
Product of the distinct prime numbers

The prime factorization of 21397981 is 23 × 11 × 83 × 1019. Since it has a total of 4 prime factors.

Most popular turbo-numbers

1, 10, 99, 71, 72, 819, 8797, 9241, 3692, 36204, 834682, 814356, 7684754, 4005286, 30958154, 75228912, 771058005, 37582891, 9324904956, 8061937787

Basic calculations (n = 21397981)

Multiplication

n×y
n×2 42795962
n×3 64193943
n×4 85591924
n×5 106989905

Division

n÷y
n÷2 10698990.5
n÷3 7132660.3333333
n÷3 5349495.25
n÷5 4279596.2

Exponentiation

ny
n2 457873590876361
n3 9.7975703979741E+21
n4 2.0964822522201E+29
n5 4.4860487399844E+36

Nth Root

y√n
2√n 4625.7951748862
3√n 277.62437840786
4√n 68.013198534447
5√n 29.246544383082

Divisors of 21397981

1, 11, 23, 83, 253, 913, 1019, 1909, 11209, 20999, 23437, 84577, 257807, 930347, 1945271, 21397981

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 -21397980
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 21397981 can be divided by 16 positive divisors. The sum of these divisors (counting 21397981) is 1, the average is 0.0625.

Base conversion 21397981

Base System Value
2 Binary 1010001101000000111011101
3 Ternary 1111021010111211
4 Quaternary 1101220013131
5 Quinary 20434213411
6 Senary 2042344421
8 Octal 121500735
10 Decimal 21397981
12 Duodecimal 71bb111
16 Hexadecimal 14681dd
20 Vigesimal 6deej1
36 Base36 cqmsd

Cryptographic Hash Functions

md5 b378517930a0b087e92a8ca7203ab571
sha1 9913bbcfec1c5177b28e5712b8ac52bef5feb311
sha256 532e976a3b4a095ed79ea81b8c2cebaf9a7642a4bbc32224c10c65386f1e6c8c
sha512 4e8871d916666c4994e880bad9a93575e9f9abcc1d86a026a3926de032131cb1ea7ce5ae76a3664e1179005ecef7bae3c0726282b3622175c1fadc5ba815d6ae
ripemd-160 ed73dd7d9a936dcf8c45865354b71e22b479ad8a

21397981 as geometric shapes

Circle

Radius = n
Diameter 42795962
Circumference 134447479.82251
Area 1.43845230937E+15

Sphere

Radius = n
Volume 4.1039966913739E+22
Surface area 5.7538092374798E+15
Circumference 134447479.82251

Square

Length = n
Perimeter 85591924
Area 457873590876361
Diagonal 30261314.937602

Cube

Length = n
Surface area 2747241545258166
Volume 9.7975703979741E+21
Space diagonal 37062390.271393

Equilateral Triangle

Length = n
Perimeter 64193943
Area 1.9826508071047E+14
Altitude 18531195.135697

Triangular Pyramid

Length = n
Surface area 1.9826508071047E+14
Volume 1.1546547445934E+21
Height 10087104.979201