Properties of the Number 42821

Forty-Two Thousand Eight Hundred Twenty-One

Basics

Value: 42820 → 42821 → 42822

Parity: odd

Prime: Yes

Previous Prime: 42797

Next Prime: 42829

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 42821

Divisors: 1, 42821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010011101000101

Octal: 123505

Duodecimal: 20945

Hexadecimal: a745

Square: 1833638041

Square Root: 206.93235609734887

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 forests of rooted trees with total weight n, where a node at height k has weight 2^k (with root considered to be at height 0). A115593

T(n,k)=Number of arrays of n integers in -k..k with sum zero and equal numbers of elements greater than zero and less than zero. A201811

Primes of a056240-type 3. A300359

Records in A353717. A353722

Number of arrays of n integers in -5..5 with sum zero and equal numbers of elements greater than zero and less than zero. A201808

Number of arrays of 6 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero. A201814

Numbers k such that k+x+y is a perfect cube, where·and y are the two cubes nearest to k. A238599

Denominators of continued fraction convergents to sqrt(941). A42821