Properties of the Number 21197

Twenty-One Thousand One Hundred Ninety-Seven

Basics

Value: 21196 → 21197 → 21198

Parity: odd

Prime: No

Previous Prime: 21193

Next Prime: 21211

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 41 × 47

Divisors: 1, 11, 41, 47, 451, 517, 1927, 21197

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011001101

Octal: 51315

Duodecimal: 10325

Hexadecimal: 52cd

Square: 449312809

Square Root: 145.59189537882938

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(n) = n³ - 4·n² + 6·n - 2. A188377

Triangle, read by rows, equal to the matrix square of A113381. Also given by: Q² = R·P = R·Q*(R^-2)*Q·R = P·Q*(P^-2)*Q·P, using triangular matrices P=A113370, Q=A113381 and R=A113389. A113384

a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2·n - 2 - 2^p+1 and p is the unique integer such that 2^p < n-1 <= 2^p+1, with a(1) = 1, a(2) = 3, and a(3) = 4. A49979

Numbers n such that n¹⁰+10 is prime. A239347

Base-8 palindromes that start with 5. A43025

Partial sums of A065641. A174202

T(n,k)=Number of (n+2)X(k+2) 0..1 matrices with each 3X3 subblock idempotent. A224559

Decimal expansion of 1/193. A21197

A 7 X 7 prime panmagic square read by rows. A162386