Properties of the Number 21893

Twenty-One Thousand Eight Hundred Ninety-Three

Basics

Value: 21892 → 21893 → 21894

Parity: odd

Prime: Yes

Previous Prime: 21881

Next Prime: 21911

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 21893

Divisors: 1, 21893

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010110000101

Octal: 52605

Duodecimal: 10805

Hexadecimal: 5585

Square: 479303449

Square Root: 147.96283317103658

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

Primes p such that p, p+18, p+36 are consecutive primes. A52189

Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime. A255967

a(n) = a(n-1) + a(n-2) - 1. A1588

K-bit primes p such that p-2ⁱ and p+2ⁱ are composite for 0<=i<=K-1. A153352

Triangle read by rows: T(n,k) (0 <= k <= n) is the number of partitions of (n,k) into a sum of pairs. A201376

Number of bipartite partitions of n white objects and 8 black ones. A2757

Number of bipartite partitions of n white objects and 10 black ones. A2759

Operation count to create all permutations of n distinct elements using Algorithm L (lexicographic permutation generation) from Knuth's The Art of Computer Programming, Vol. 4, chapter 7.2.1.2. Sequence gives number of interchange operations in step L4. A80049

Primes of the form n² - 11. A91272

Primes of form 5+38·n². A173554