Properties of the Number 21017

Twenty-One Thousand Seventeen

Basics

Value: 21016 → 21017 → 21018

Parity: odd

Prime: Yes

Previous Prime: 21013

Next Prime: 21019

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 21017

Divisors: 1, 21017

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000011001

Octal: 51031

Duodecimal: 101B5

Hexadecimal: 5219

Square: 441714289

Square Root: 144.97241116847025

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 of the form p(k)² + q(m)² with k > 0 and m > 0, where p(.) is the partition function (A000041), and q(.) is the strict partition function (A000009). A233346

Number of uniform relatively prime rooted trees with n nodes. A317718

Primes of the form k² - 8. A28886

Non-palindromic balanced primes in base 2. A256081

Primes of the form x² + (x+3)². A76727

Primes occurring in exactly three prime triples (p,q,r) with p<q<r=p+6. A98423

a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that any five consecutive digits in the sequence sum up to a prime. A152605

Initial members of prime triples (p, p+2, p+6) for which also the sum 3p+8 is prime. A162001

Primes p such that p - 2², p - 4² and p - 6² are all positive primes. A246873

Table read by rows: list of prime 5-tuples of the form (p, p+2, p+6, p+8, p+12). A270998