Properties of the Number 21499

Twenty-One Thousand Four Hundred Ninety-Nine

Basics

Value: 21498 → 21499 → 21500

Parity: odd

Prime: Yes

Previous Prime: 21493

Next Prime: 21503

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 21499

Divisors: 1, 21499

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111111011

Octal: 51773

Duodecimal: 10537

Hexadecimal: 53fb

Square: 462207001

Square Root: 146.6253729748027

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 equivalence classes of convex lattice polygons of genus n. A322343

Smallest odd prime base q such that p³ divides q^p-1 - 1, where p = prime(n). A125637

Smaller member of a pair (p,q) of cousin primes such that p and q are in different centuries. A160440

Last member of a sexy prime quadruple: value of p+18 such that p, p+6, p+12 and p+18 are all prime. A46124

Primes p, with index k, such that p-k and p+k are both prime. A143794

Smallest number k such that the continued fraction expansion of sqrt(k) contains n distinct numbers. A187142

Numbers k such that in the ring Z[sqrt(3)] the norm of (-1+sqrt(3))^k-1 is prime. A67834

Primes p(x) satisfying the following conditions: (a) A082882(x)=1; (b) {p(x),p(x+1)} are not twin primes; (c) values of A075860(j) for j composites between these two non-twin primes are identical. A82883

a(n) = 840·n² - 23100·n + 86861. A216257

Primes of the form k!6-6, where k!6 is the sextuple factorial number (A085158). A289727