Properties of the Number 21993

Twenty-One Thousand Nine Hundred Ninety-Three

Basics

Value: 21992 → 21993 → 21994

Parity: odd

Prime: No

Previous Prime: 21991

Next Prime: 21997

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7331

Divisors: 1, 3, 7331, 21993

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111101001

Octal: 52751

Duodecimal: 10889

Hexadecimal: 55e9

Square: 483692049

Square Root: 148.30037086939467

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

Positions of 3's in A234323. A234804

Limit number of (m-n)-almost-primes in range [2^m..2^m+1-1]. A92097

Number of edges in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n. A392444

Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w³>=x³+y³. A211804

Number of ballot sequences of length 2n with exactly n fixed points. A238803

Numbers that divide the sum of the factorials of their digits in base 10. A247227

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 1), (0, 1, 0), (1, -1, 1), (1, 1, -1)}. A148437

Numbers k such that (10^k + 191)/3 is prime. A294916

Decimal expansion of 1/989. A21993