Properties of the Number 21441

Twenty-One Thousand Four Hundred Forty-One

Basics

Value: 21440 → 21441 → 21442

Parity: odd

Prime: No

Previous Prime: 21433

Next Prime: 21467

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 × 1021

Divisors: 1, 3, 7, 21, 1021, 3063, 7147, 21441

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111000001

Octal: 51701

Duodecimal: 104A9

Hexadecimal: 53c1

Square: 459716481

Square Root: 146.42745644174798

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) is the decimal concatenation of n and n². A53061

Sum of the second largest parts of the partitions of n into 10 parts. A326597

a(n) = n*(5·n²-8·n+5)/2. A226449

Given the infinite continued fraction i+(i/(i+(i/(i+...)))), where i is the square root of (-1), this is the numerator of the imaginary part of the convergents. A91808

Average of three successive primes squared, (prime(n)²+prime(n+1)²+prime(n+2)²)/3, n>=3. A75893

Triangle T(n, k, q) = ∑_j=0..10 q^j * floor( binomial(n+1,k)*binomial(n-1,k-1)/(2^j*(n+1)) ) for q = 3, read by rows. A174045

Constant term of the reduction by x² -> x+1 of the polynomial p(n,x) defined at Comments. A192975

a(n+1) = a(n) converted to base 9 from base 8 (written in base 10). A23391

Expansion of 1/((1-x)(1-5x)(1-10x)). A16237

Decimal expansion of 1/437. A21441