Properties of the Number 21850

Twenty-One Thousand Eight Hundred Fifty

Basics

Value: 21849 → 21850 → 21851

Parity: even

Prime: No

Previous Prime: 21841

Next Prime: 21851

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 ² × 19 × 23

Divisors: 1, 2, 5, 10, 19, 23, 25, 38, 46, 50

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101011010

Octal: 52532

Duodecimal: 1078A

Hexadecimal: 555a

Square: 477422500

Square Root: 147.81745499094484

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Fifth column of the (1,4)-Pascal triangle A095666. A95667

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n), where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A296266

a(n) = n*(n + 1)*(n² - n + 3)/6. A257055

Number of ways to write n as an ordered sum of ten powers of 2. A342254

a(n) = n*(n + 1)*(19·n - 16)/6. A237618

Tribonacci representation of 2ⁿ, written in base 10. A305380

a(0)=a(1)=1. a(n) = the multiple of n which is > a(n-1)+a(n-2) and is <= a(n-1)+a(n-2)+n. A128034

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 318", based on the 5-celled von Neumann neighborhood. A271252

Sequences n*(n+1)*(6·n+1)/2 and n*(n+1)*(7·n+1)/2 interleaved. A296636

Numbers whose base-2 representation has exactly 14 runs. A43581