Properties of the Number 21163

Twenty-One Thousand One Hundred Sixty-Three

Basics

Value: 21162 → 21163 → 21164

Parity: odd

Prime: Yes

Previous Prime: 21157

Next Prime: 21169

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 21163

Divisors: 1, 21163

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001010101011

Octal: 51253

Duodecimal: 102B7

Hexadecimal: 52ab

Square: 447872569

Square Root: 145.4750837772572

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

Numbers k such that 15^k - 2 is a prime. A128458

a(n)=a(n-1)+a(m), where m=2n-2-2^p+1 and 2^p<n-1<=2^p+1, for n >= 4. A50063

Primes obtained from other primes by pre-concatenating with 2. A165243

Primes of the form 3·m² - 5. A201717

Primes p such that p+2⁴, p+2⁶ and p+2⁸ are all primes. A269257

Smallest of three consecutive primes in arithmetic progression with common difference 24 and digit sum prime. A253140

a(n) = ∑_d∣n φ(d)*Bell(n/d) for n>0, a(0) = 0. A258171

Prime numbers ending in the prime number 163. A167627

G.f.: ∑_n>=0 xⁿ * ∏_k=1..n (1 + k·x) / (1 - x - k·x²). A231291

Primes p such that p - d and p + d are also primes, where d is the largest digit of p. A245877