Properties of the Number 21599

Twenty-One Thousand Five Hundred Ninety-Nine

Basics

Value: 21598 → 21599 → 21600

Parity: odd

Prime: Yes

Previous Prime: 21589

Next Prime: 21601

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 21599

Divisors: 1, 21599

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010001011111

Octal: 52137

Duodecimal: 105BB

Hexadecimal: 545f

Square: 466516801

Square Root: 146.96598245852678

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

Smallest number of complexity n: smallest number requiring n 1's to build using + and *. A5520

Square array where the row n lists all numbers k for which A329697(k) = n, read by falling antidiagonals. A334100

Primes of the form 6n² - 1. A90686

Primes p such that (p-1)/2 and (p-3)/4 are also prime. A66179

The lesser of twin prime pairs with each prime in a different century. A158277

Primes of the form 16·k-1 such that 4·k-1 and 8·k-1 are also primes. A101793

Primes p such that 5 is the largest of all prime factors of the numbers between p and the next prime (cf. A052248). A80185

Primes of the form 32·k-1 such that 4·k-1, 8·k-1 and 16·k-1 are also primes. A101798

Triple-safe primes p: p, (p-1)/2, (p-3)/4, and (p-7)/8 are all prime. A157358

a(n) is the sum of the smallest parts of all partitions of n that do not contain 1 as a part. A182708