Properties of the Number 21943

Twenty-One Thousand Nine Hundred Forty-Three

Basics

Value: 21942 → 21943 → 21944

Parity: odd

Prime: Yes

Previous Prime: 21937

Next Prime: 21961

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 21943

Divisors: 1, 21943

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010110110111

Octal: 52667

Duodecimal: 10847

Hexadecimal: 55b7

Square: 481495249

Square Root: 148.13169816079204

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

Least k such that (n^k+1)/(n+1) is prime, or 0 if no such prime exists. A84742

Smallest prime q such that (p^q+1)/(p+1) is a prime, where p = prime(n). A65507

Least number k > 0 such that ((2n-1)^k + 1)/(2n) is prime, or 0 if no such prime exists. A126659

Largest prime < n³. A77037

Primes p = p_n+1 such that p_n + p_n+2 = 2·p_n+1 + 12. A95673

Sum of the largest parts in the partitions of n into 8 parts. A308998

Numbers n such that [A070080(n), A070081(n), A070082(n)] is an obtuse isosceles integer triangle with prime side lengths. A70135

Primes p having exactly one partition into distinct divisors of p+1. A85499

Numbers k such that both k and k + 3 are consecutive deficient numbers. A317049

a(n) = 2·n³ - 313·n² + 6823·n - 13633. A218456