Properties of the Number 21995

Twenty-One Thousand Nine Hundred Ninety-Five

Basics

Value: 21994 → 21995 → 21996

Parity: odd

Prime: No

Previous Prime: 21991

Next Prime: 21997

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 53 × 83

Divisors: 1, 5, 53, 83, 265, 415, 4399, 21995

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111101011

Octal: 52753

Duodecimal: 1088B

Hexadecimal: 55eb

Square: 483780025

Square Root: 148.30711378757258

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

Triangle T(n,k) giving number of 4 X k polyominoes with n cells (n >= 4, 1<=k<=n-3). A59684

an=n-th smallest integer m=p1·p2·p3, product of 3 odd primes such that d+2m/d are all primes for d dividing 2m. A128278

Decimal expansion of 1/991. A21995