Properties of the Number 21924

Twenty-One Thousand Nine Hundred Twenty-Four

Basics

Value: 21923 → 21924 → 21925

Parity: even

Prime: No

Previous Prime: 21911

Next Prime: 21929

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ³ × 7 × 29

Divisors: 1, 2, 3, 4, 6, 7, 9, 12, 14, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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4823 Try Today's Challenge

Representations

Binary: 101010110100100

Octal: 52644

Duodecimal: 10830

Hexadecimal: 55a4

Square: 480661776

Square Root: 148.06755215103678

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) = n*(n-1)*(n-2) (or n!/(n-3)!). A7531

Numbers n such that there exists an x≠n that makes {n,n,x} an amicable multiset. A259302

a(n) = (2n+1)*(2n+2)*(2n+3). A69072

Numbers that belong to at least one amicable multiset. A259307

a(n) = (4·n-1)*4·n*(4·n+1). A69140

Number of espalier polycubes of a given volume in dimension 3. A229915

a(n) = lcm(n,n+1,n+2). A33931

Denominator of b(n)-b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896. A51713

Indices k such that A019322(k) = φ[k](4) is prime, where φ is a cyclotomic polynomial. A138934

Abundant numbers n such that σ(σ(n) - 2·n) = σ(n). A292365