Properties of the Number 26821

Twenty-Six Thousand Eight Hundred Twenty-One

Basics

Value: 26820 → 26821 → 26822

Parity: odd

Prime: Yes

Previous Prime: 26813

Next Prime: 26833

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 26821

Divisors: 1, 26821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100011000101

Octal: 64305

Duodecimal: 13631

Hexadecimal: 68c5

Square: 719366041

Square Root: 163.77118183612157

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 parts > 1 in the last section of the set of partitions of n. A138135

a(0)=1, a(1)=1, a(n) = largest prime <= a(n-1) + a(n-2). A55500

Primes p such that A001175(p) = (p-1)/6. A308791

Primes p such that A001177(p) = (p-1)/6. A308799

Primes p such that the number of primes less than p equal to 1 mod 4 is two less than the number of primes less than p equal to 3 mod 4. A96451

Primes that are palindromic in base 12. A29979

a(0)=1, a(1)=2, a(n) = largest prime < a(n-1)+a(n-2). A55501

Number of parts in all partitions of 2n+1 that do not contain 1 as a part. A182735

a(n) = numerator of b(n), where b(1)=1, b(n+1) = sum{k∣n} 1/b(k). A127939

a(n) = denominator of b(n), where b(1)=1, b(n+1) = sum{k∣n} 1/b(k). A127940