Properties of the Number 21447

Twenty-One Thousand Four Hundred Forty-Seven

Basics

Value: 21446 → 21447 → 21448

Parity: odd

Prime: No

Previous Prime: 21433

Next Prime: 21467

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2383

Divisors: 1, 3, 9, 2383, 7149, 21447

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001111000111

Octal: 51707

Duodecimal: 104B3

Hexadecimal: 53c7

Square: 459973809

Square Root: 146.4479429695071

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 number with top and left being the most significant digits. A263373

Least integer k such that k/2ⁿ > φ², where φ = (1+sqrt(5))/2 = golden ratio. A293320

The integer k that minimizes |k/2ⁿ - φ²|, where φ = (1+sqrt(5))/2 = golden ratio. A293321

Total sum of 6th powers of parts in all partitions of n. A229328

Total sum of n-th powers of parts in all partitions of 5. A229356

Decimal part of a(n)^1/5 starts with a 'nine digits' anagram. A34280

Number of (n+1)X(2+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 number with top and left being the most significant digits. A263367

Binomial transform of denominators in a ζ function. A106398

Number of maximal cones in the prime degree p>2 superelliptic locus of the moduli space of tropical curves of genus (p-1)(n/2-1) coming from coverings with n ramification points. A292615

Total sum A(n,k) of k-th powers of parts in all partitions of n; square array A(n,k), n>=0, k>=0, read by antidiagonals. A213191