Properties of the Number 21998

Twenty-One Thousand Nine Hundred Ninety-Eight

Basics

Value: 21997 → 21998 → 21999

Parity: even

Prime: No

Previous Prime: 21997

Next Prime: 22003

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 17 × 647

Divisors: 1, 2, 17, 34, 647, 1294, 10999, 21998

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111101110

Octal: 52756

Duodecimal: 10892

Hexadecimal: 55ee

Square: 483912004

Square Root: 148.31722759005442

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

Sum of the sixth largest parts of the partitions of n into 10 parts. A326593

Fibonacci iteration starting with (1, a(n)) leads to a "nine digits anagram". A34587

Expansion of g/(1 - x·g²)², where g = 1+x·g⁴ is the g.f. of A002293. A390237

Numbers whose anti-divisors sum to a perfect cube. A109351

Site series for first parallel moment of Kagome lattice. A120550

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 291", based on the 5-celled von Neumann neighborhood. A271131

Number of fusenes with 25 hexagons, C_2v symmetry and containing n carbon atoms. A123598

Number of tilings of an n X 9 rectangle using integer-sided rectangular tiles of area n. A220134

Number of binary arrays of length 2·n+6 with no more than n ones in any length 2n subsequence (=50% duty cycle). A212408

Decimal expansion of 1/994. A21998