Properties of the Number 21481

Twenty-One Thousand Four Hundred Eighty-One

Basics

Value: 21480 → 21481 → 21482

Parity: odd

Prime: Yes

Previous Prime: 21467

Next Prime: 21487

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 21481

Divisors: 1, 21481

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001111101001

Octal: 51751

Duodecimal: 10521

Hexadecimal: 53e9

Square: 461433361

Square Root: 146.5639792036229

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

Primes p such that p, p+6, p+12, p+18 are all primes. A23271

Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[6, 4,2]; short d-string notation of pattern = [642]. A78855

a(n) is the smallest k such that prime(k+i) (mod 6) takes successively the values 5, 5, ... for i = 0, 1, ..., n-1. A247967

Primes that are palindromic in base 5. A29973

Primes that begin a run of consecutive primes in A375564. A376193

Primes of the form x² + 5·y², where·and y=x+1 are consecutive natural numbers. A176608

Hyperartiads. A270798

Primes p such that each of the numbers p^k for k=1..5 has exactly two 1s in its decimal representation. A175964

Prime numbers congruent to 49 or 121 modulo 240 representable by x² + 150·y². A325089

a(n) is the least k such that the residues mod 3 of the primes prime(k), prime(k+1), ... comprise a string of n 2's followed by 1. A391796