Properties of the Number 21451

Twenty-One Thousand Four Hundred Fifty-One

Basics

Value: 21450 → 21451 → 21452

Parity: odd

Prime: No

Previous Prime: 21433

Next Prime: 21467

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 19 × 1129

Divisors: 1, 19, 1129, 21451

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001111001011

Octal: 51713

Duodecimal: 104B7

Hexadecimal: 53cb

Square: 460145401

Square Root: 146.46159906268946

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

Number of isomorphism classes of nanocones with 5 pentagons and a symmetric boundary of length n. A198086

Structured tetrakis hexahedral numbers (vertex structure 5). A100174

Values of m, the main key or generating number for Pythagorean triangles in which S (the odd short leg) and U (the hypotenuse) are twin primes. A51891

a(n) = floor(5·prime(n)² / 4). A246010

Number of Motzkin excursions of length n with an even number of humps. A307564

Centered 10-gonal numbers which are products of two primes. A367792

Number of 2n-step polygons on cubic lattice. A2896

Array read by antidiagonals: T(n,k) is the number of 2·n X 2·k binary matrices with all row sums k and column sums n. A376935

Decimal expansion of 1/447. A21451