Properties of the Number 21269

Twenty-One Thousand Two Hundred Sixty-Nine

Basics

Value: 21268 → 21269 → 21270

Parity: odd

Prime: Yes

Previous Prime: 21247

Next Prime: 21277

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 21269

Divisors: 1, 21269

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100010101

Octal: 51425

Duodecimal: 10385

Hexadecimal: 5315

Square: 452370361

Square Root: 145.8389522727039

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

a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n-1)*a(n-2) + 1. A186738

Primes p such that p-3 and p+3 are divisible by a cube. A89201

Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4. A152294

Primes of the form floor(binomial(k,2)/4). A171574

Denominators of continued fraction convergents to sqrt(617). A42185

Total number of parts >= 3 in all partitions of n. A207033

Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 2. A240011

Least prime p such that prime(p·n)-1 is a square, or 0 if no such p exists. A259764

Primes prime(k) such that (prime(k-1) + prime(k+1) + prime(k+2))/prime(k) = 3. A94933

Primes congruent to 41 mod 61. A142839