Properties of the Number 21241

Twenty-One Thousand Two Hundred Forty-One

Basics

Value: 21240 → 21241 → 21242

Parity: odd

Prime: No

Previous Prime: 21227

Next Prime: 21247

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 11 × 1931

Divisors: 1, 11, 1931, 21241

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011111001

Octal: 51371

Duodecimal: 10361

Hexadecimal: 52f9

Square: 451180081

Square Root: 145.74292435655323

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

Numbers k such that k + σ(k) + σ(σ(k)) is a square. A116014

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones. A31868

Denominators of continued fraction convergents to sqrt(703). A42353

Centered 12-gonal numbers which are semiprimes, intersection of A003154 and A001358. A218172

a(n) = prime(n)ⁿ mod nⁿ. A262207

Decimal expansion of 1/237. A21241