Properties of the Number 21798

Twenty-One Thousand Seven Hundred Ninety-Eight

Basics

Value: 21797 → 21798 → 21799

Parity: even

Prime: No

Previous Prime: 21787

Next Prime: 21799

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 7 × 173

Divisors: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010100100110

Octal: 52446

Duodecimal: 10746

Hexadecimal: 5526

Square: 475152804

Square Root: 147.64145759237138

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

Numbers k such that k and 4·k are anagrams. A23088

Array read by antidiagonals: T(n,k) is the number of series-reduced rooted trees with n leaves of k colors. A319254

Number of partitions of n such that (greatest part) - (least part) > number of parts. A237833

Number of n-node planar graphs with even degrees. A49339

Increasing partial quotients of the continued fraction for agm(1,i)/(1+i). A76392

a(n) = 9·a(n-1) - 9·a(n-2) + a(n-3). A95003

Decimal expansion of 1/794. A21798