Properties of the Number 21167

Twenty-One Thousand One Hundred Sixty-Seven

Basics

Value: 21166 → 21167 → 21168

Parity: odd

Prime: No

Previous Prime: 21163

Next Prime: 21169

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 61 × 347

Divisors: 1, 61, 347, 21167

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010101111

Octal: 51257

Duodecimal: 102BB

Hexadecimal: 52af

Square: 448041889

Square Root: 145.48883118645224

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

Sum of the squarefree parts of the partitions of n into 6 parts. A309481

a(n) = 12·n² - 1. A158463

Largest integer not expressible as a nonnegative linear combination of n and n² + 1. A87908

Numbers k such that 7·R_k - 4 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A99420

Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways. A180089

a(n) = 48·n² - 1. A65532

Numerator of next-best approximation to harmonic numbers. a(n) = Numerator of (A055573(n)-1)th convergent of n-th harmonic number, ∑_k=1..n 1/k. A113123

a(n) = 784·n - 1. A158399

Number of solutions to 1³*k₁ + 2³*k₂ + ... + n³*k_n = 1, where k_i are from {-1,0,1}, i=1..n. A369735

Frobenius number of the numerical semigroup generated by consecutive hex numbers. A69759