Properties of the Number 21089

Twenty-One Thousand Eighty-Nine

Basics

Value: 21088 → 21089 → 21090

Parity: odd

Prime: Yes

Previous Prime: 21067

Next Prime: 21101

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 21089

Divisors: 1, 21089

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001001100001

Octal: 51141

Duodecimal: 10255

Hexadecimal: 5261

Square: 444745921

Square Root: 145.2205219657332

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 partitions p of n such that (1/4)*max(p) is a part of p. A363067

Smallest primes of 4 X 4 semimagic squares formed from consecutive primes. A270865

Primes whose digits can be arranged in increasing cyclic order - to form a substring of 123456789012345678901234567890... A68710

The smallest prime p that makes the pair p+/-6n both primes while no other pair of p+/-6k+6·n, 0<k<n both primes. A139602

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

Lesser of two consecutive primes, p < q, such that both p·q+p-q and p·q-p+q are prime numbers. A154553

Cyclops Sophie-Germain primes. A183058

Fifth prime p such that (p+n)²+n is prime but (p+j)²+j is not prime for all 0<j<n. A238677

Primes p such that 2·p+1 and ((2·p+1)² + 1)/2 = p² + (p+1)² are primes. A98717

Primes congruent to 26 mod 59. A142753