Properties of the Number 21618

Twenty-One Thousand Six Hundred Eighteen

Basics

Value: 21617 → 21618 → 21619

Parity: even

Prime: No

Previous Prime: 21617

Next Prime: 21647

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1201

Divisors: 1, 2, 3, 6, 9, 18, 1201, 2402, 3603, 7206

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010001110010

Octal: 52162

Duodecimal: 10616

Hexadecimal: 5472

Square: 467337924

Square Root: 147.03060905811415

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

Number of partitions of n into 3 or more parts. A4250

Number of integer partitions of n into three or more parts or into two equal parts. A349801

Number of nX2 0..1 arrays with every row and column least squares fitting to a nonnegative slope straight line, with a single point array taken as having zero slope. A222856

Numbers n such that 3·n and n³ have the same digit sum. A260906

Powers of fifth root of 4 rounded down. A18123

Powers of fifth root of 8 rounded down. A18135

Powers of fifth root of 16 rounded down. A18159

Vinogradov's constants arising in enumeration of solutions to Waring's problem in the evil numbers (A001969). A206375

Table read by antidiagonals: T(n,k) is the number of n X k 0..1 arrays with every row and column least squares fitting to a nonnegative-slope straight line, with a single point array taken as having zero slope. A222862

Decimal expansion of 1/614. A21618