Properties of the Number 21461

Twenty-One Thousand Four Hundred Sixty-One

Basics

Value: 21460 → 21461 → 21462

Parity: odd

Prime: No

Previous Prime: 21433

Next Prime: 21467

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 11 × 1951

Divisors: 1, 11, 1951, 21461

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001111010101

Octal: 51725

Duodecimal: 10505

Hexadecimal: 53d5

Square: 460574521

Square Root: 146.49573372627614

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

Numbers k such that σ(k+2) = σ(k). A7373

Pell equation solutions (6·a(n))² - 37·b(n)² = -1 with b(n):=A097730(n), n >= 0. A97729

Structured disdyakis triacontahedral numbers (vertex structure 11). A100158

Expansion of (1+3·x+9·x²+9·x³+9·x⁴+3·x⁵+x⁶) /( (1+x)² * (1-x)⁵ ). A175898

a(n) = (35·n⁴ - 35·n³ + 55·n² - 25·n + 6)/6. A181343

Expansion of x⁴/[(1+x)*∏_k=1..3 (1-k·x)]. A243869

From the graph reconstruction problem. A6655

Half-convolution of sequence A000032 (Lucas) with itself. A201207

a(n) = the number of cubes (of integers > 0) that have bit length n. A365932

Bisection of A201207 (half-convolution of the Lucas sequence A000032 with itself); even part. A203570