Properties of the Number 21031

Twenty-One Thousand Thirty-One

Basics

Value: 21030 → 21031 → 21032

Parity: odd

Prime: Yes

Previous Prime: 21023

Next Prime: 21059

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 21031

Divisors: 1, 21031

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000100111

Octal: 51047

Duodecimal: 10207

Hexadecimal: 5227

Square: 442302961

Square Root: 145.0206881793077

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 magic labelings of the prism graph I X C₅ with magic sum n. A244497

Smallest prime that is obtained by placing digits on both sides of the n-th prime. Or smallest prime that encompasses the n-th prime. A75595

Primes of the form 2·n² + 58·n + 27. A217498

Primes of the form k²+6. A56909

Primes for which the five closest primes are smaller. A75037

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

Primes p such that q-p = 28, where q is the next prime after p. A124595

Primes p dividing every A167859(m) from m=(p-1)/2 to m=(p-1). A167860

Primes such that A271229(n) = prime(n). A276649

a(1) = 2; a(n + 1) = smallest prime > a(n) such that a(n + 1) - a(n) is the product of 7 primes. A285692