Properties of the Number 21446

Twenty-One Thousand Four Hundred Forty-Six

Basics

Value: 21445 → 21446 → 21447

Parity: even

Prime: No

Previous Prime: 21433

Next Prime: 21467

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 10723

Divisors: 1, 2, 10723, 21446

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001111000110

Octal: 51706

Duodecimal: 104B2

Hexadecimal: 53c6

Square: 459930916

Square Root: 146.4445287472359

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

Sum of the largest parts of the partitions of n into 9 squarefree parts. A326532

a(n) = 81·n² - 118·n + 43. A156677

Greatest integer k such that k/2ⁿ < φ², where φ = (1+sqrt(5))/2 = golden ratio. A293319

The second smallest k such that A003415(k) == A276086(k) mod A002110(n), or -1 if no such k exists, where A003415 is the arithmetic derivative, A276086 is the primorial base exp-function, and A002110 gives the n-th primorial. A373603

Numbers k such that A276086(k) is a multiple of A003415(k) and A276087(k) is a multiple of A327859(k). A393071

Numbers k such that primorial base expansion of A276086(k) has the primorial base expansion of A003415(k) as its suffix, where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function. A383933

Number of fundamentally different graceful labelings of the n-pan graph. A387804

Triangle read by rows: T(n,k) is the number of paths in the first quadrant from (0,0) to (n,0), consisting of steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0), having k doublerises (i.e., UU's) (0 <= k <= floor(n/2) - 1 for n >= 2). A132279

Decimal expansion of 1/442. A21446