Properties of the Number 21851

Twenty-One Thousand Eight Hundred Fifty-One

Basics

Value: 21850 → 21851 → 21852

Parity: odd

Prime: Yes

Previous Prime: 21841

Next Prime: 21859

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 21851

Divisors: 1, 21851

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010101011011

Octal: 52533

Duodecimal: 1078B

Hexadecimal: 555b

Square: 477466201

Square Root: 147.8208375027012

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

Balanced primes of order seven. A96699

Prime number spiral (clockwise, Northeast spoke). A54553

Number of factorization patterns of polynomials of degree n over F₅. A6170

A set of nine consecutive primes forming a 3 X 3 semimagic square with the smallest magic constant (65573). A265614

a(0) = 1, a(1) = 1, a(n) = 6·a(n-1) + 5·a(n-2) for n > 1. A123362

Primes p with same last two digits as k, where prime(k) = p. A232102

Primes followed by an [8,4,8]=[d,D-d,d] prime difference pattern of A001223. A52377

Number of non-equivalent ways (mod D₂) to select 4 points from n equidistant points on a straight line so that no selected point is equally distant from two other selected points. A300761

Discriminants of imaginary quadratic fields with class number 39 (negated). A351677

Primes p such that p + 8, p + 12 and p + 20 are also primes. A384299