Properties of the Number 21942

Twenty-One Thousand Nine Hundred Forty-Two

Basics

Value: 21941 → 21942 → 21943

Parity: even

Prime: No

Previous Prime: 21937

Next Prime: 21943

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 23 × 53

Divisors: 1, 2, 3, 6, 9, 18, 23, 46, 53, 69

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010110110110

Octal: 52666

Duodecimal: 10846

Hexadecimal: 55b6

Square: 481451364

Square Root: 148.12832274754211

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

Expansion of (g/(1 - x·g))³, where g = 1+x·g³ is the g.f. of A001764. A391175

Alkane (or paraffin) numbers l(13,n). A18214

Numbers n such that (6ⁿ+1)²-2 is prime. A100902

Ulam's spiral (WNW spoke). A143859

Alkane (or paraffin) numbers l(11,n). A18212

Expansion of ((η(q²) * η(q¹⁴)) / (η(q) * η(q⁷)))³ in powers of q. A120006

Expansion of η(q⁴) * η(q²⁸) / (η(q) * η(q⁷)) in powers of q. A123648

Number of canonical 3-polytopes of size n. A319959

Numbers n that divide the sum of digits of 36ⁿ. A220364

Number of n-element subsets of [n+10] having an even sum. A282086