Properties of the Number 21011

Twenty-One Thousand Eleven

Basics

Value: 21010 → 21011 → 21012

Parity: odd

Prime: Yes

Previous Prime: 21001

Next Prime: 21013

Digit Sum: 5

Digital Root: 5

Palindrome: No

Factorization: 21011

Divisors: 1, 21011

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001000010011

Octal: 51023

Duodecimal: 101AB

Hexadecimal: 5213

Square: 441462121

Square Root: 144.95171609884446

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

Prime quadruples: numbers k such that k, k+2, k+6, k+8 are all prime. A7530

Initial members p of prime 5-tuples (p, p+2, p+6, p+8, p+12). A22006

Primes whose decimal representation also represents a prime in base 3. A89981

n written in fractional base 3/2. A24629

Primes p such that three (the maximum number) primes occur between p and p+12. A86140

Primes having only {0, 1, 2} as digits. A36953

Numbers k such that 2^k - 9 is prime. A59610

Primes whose sum of digits is 5. A62341

Primes p such that the polynomial x² + x + p generates only primes for x = 0, ..., 4. A187057

Primes with arithmetic mean of digits = 1 (sum of digits = number of digits). A69710