Properties of the Number 21951

Twenty-One Thousand Nine Hundred Fifty-One

Basics

Value: 21950 → 21951 → 21952

Parity: odd

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 271

Divisors: 1, 3, 9, 27, 81, 271, 813, 2439, 7317, 21951

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010110111111

Octal: 52677

Duodecimal: 10853

Hexadecimal: 55bf

Square: 481846401

Square Root: 148.15869869838895

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

a(n) = n³ - 1. A68601

Numbers k such that the odd part of (1+k) divides (1 + odd part of σ(k)). A336700

Numbers k such that k!! + 2⁴ is prime. A76189

Values for b in abc-triples with a=1. A216323

a(n) = 1 - n³. A24001

Reflected (see A074058) pentanacci numbers A074048. A74062

Bases in which 7 is a unique-period prime. A306075

Triangle T(n,k) read by rows: T(n,k) = number of ways of seating n people around a table for the second time so that k pairs are maintained. Reflected sequences are counted as one. A326397

Nearest integer to γ(n + 3/11)/γ(3/11). A20012

a(n) = floor(γ(n+3/11)/γ(3/11)). A20057