Properties of the Number 21587

Twenty-One Thousand Five Hundred Eighty-Seven

Basics

Value: 21586 → 21587 → 21588

Parity: odd

Prime: Yes

Previous Prime: 21577

Next Prime: 21589

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 21587

Divisors: 1, 21587

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010001010011

Octal: 52123

Duodecimal: 105AB

Hexadecimal: 5453

Square: 465998569

Square Root: 146.9251510123437

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 integer partitions of n having a part that can be written as a nonnegative linear combination of the other (possibly equal) parts. A364913

Start of a string of exactly 3 consecutive (but disjoint) pairs of twin primes. A35791

Primes p such that p·q-p-q and p·q+p+q are prime where q=nextprime(p). A128548

Initial members of prime sextuples (p, p+2, p+12, p+14, p+24, p+26). A253624

Lesser of twin primes (p,q=p+2) such that p·q-p-q and p·q+p+q are primes. A126334

Primes that remain prime through 3 iterations of function f(x) = 2x + 3. A23273

Numerators of continued fraction convergents to sqrt(180). A41332

Sixth term of weak prime sextet: p(m-4)-p(m-5) < p(m-3)-p(m-4) < p(m-2)-p(m-3) < p(m-1)-p(m-2) < p(m)-p(m-1). A54833

Lesser of the first pair of three successive prime pairs (no isolated primes occur in between). Least of the six successive primes which are member of prime pairs. A90953

Total number of parts of multiplicity 6 in all partitions of n. A222706