Properties of the Number 21996

Twenty-One Thousand Nine Hundred Ninety-Six

Basics

Value: 21995 → 21996 → 21997

Parity: even

Prime: No

Previous Prime: 21991

Next Prime: 21997

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 13 × 47

Divisors: 1, 2, 3, 4, 6, 9, 12, 13, 18, 26

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101010111101100

Octal: 52754

Duodecimal: 10890

Hexadecimal: 55ec

Square: 483824016

Square Root: 148.3104851316993

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

Number of integer partitions of n where the parts do not have the same median as the distinct parts. A360244

Numbers that have exactly six prime factors counted with multiplicity (A046306) whose digit reversal is different and also has 6 prime factors (with multiplicity). A109026

a(n) = (n-4)*(n+1)*(n+3)/6. A275874

a(n) = ∑_{1 <= j <= n/2, gcd(j,n)=1} j³. A295575

Tribonacci numbers that start with first three squares. A86192

Augmentation of the triangular array P given by p(n,k)=k! for 0<=k<=n. See Comments. A193092

p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S³)³. A291143

Numbers k such that k divides sum of k-th twin prime pair. A335303

Numbers k such that 7^k + 2 is semiprime. A119720

a(n) is the smallest positive number that is the sum of no fewer than n distinct repdigits. A336759