Properties of the Number 21550

Twenty-One Thousand Five Hundred Fifty

Basics

Value: 21549 → 21550 → 21551

Parity: even

Prime: No

Previous Prime: 21529

Next Prime: 21557

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 ² × 431

Divisors: 1, 2, 5, 10, 25, 50, 431, 862, 2155, 4310

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010000101110

Octal: 52056

Duodecimal: 1057A

Hexadecimal: 542e

Square: 464402500

Square Root: 146.79918255903198

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

Indices of primes followed by a gap (distance to next larger prime) of 44. A320720

Coefficient of x² in the polynomial (x-p(n))*(x-p(n+1))*(x-p(n+2))*(x-p(n+3)), where p(k) is the k-th prime. A127348

Position of n-th appearance of 2n in the sequence of prime gaps (A001223). If 2n does not appear at least n times, set a(n) = -1. A356223

Numbers k such that 15·2^k + 1 is prime. A2258

Expansion of g.f. 1/((1-x²+x³+x⁴-x⁵)*(1-x-x²+x³-x⁵)). A147598

Expansion of ∏_m>=1 (1+m·q^m)^-20. A22712

Decimal expansion of 1/546. A21550