Properties of the Number 21915

Twenty-One Thousand Nine Hundred Fifteen

Basics

Value: 21914 → 21915 → 21916

Parity: odd

Prime: No

Previous Prime: 21911

Next Prime: 21929

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 487

Divisors: 1, 3, 5, 9, 15, 45, 487, 1461, 2435, 4383

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010110011011

Octal: 52633

Duodecimal: 10823

Hexadecimal: 559b

Square: 480267225

Square Root: 148.03715749770393

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) = sum of all distinct multiplicities in every integer partition of n. A373273

a(n)=largest permutational number of order n - smallest permutational number of order n+1 : A062813(n)-A134703(n+1) : A134640(!n)-A134640(!n+1). A134748

Numbers n which divide the periodic part (with zeros at end) of the decimal expansion of 1/n. A179267

Numbers m such that m²+1 is semiprime with (m-1)²+1 and (m+1)²+1 primes. A321985

Reversion of y - y² + y⁴. A63033

Decimal expansion of 1/911. A21915