Properties of the Number 22821

Twenty-Two Thousand Eight Hundred Twenty-One

Basics

Value: 22820 → 22821 → 22822

Parity: odd

Prime: No

Previous Prime: 22817

Next Prime: 22853

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7607

Divisors: 1, 3, 7607, 22821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101100100100101

Octal: 54445

Duodecimal: 11259

Hexadecimal: 5925

Square: 520798041

Square Root: 151.06621064950295

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

Column 2 of triangle A128545; a(n) is the coefficient of q²ⁿ⁺⁴ in the central q-binomial coefficient [2n+4,n+2]. A128552

Partial sums of A255744. A255765

Expansion of exp(3·x) - exp(x)*(1-BesselI₀(2·x)). A81673

Numerators of the convergents given by treating A072193 as continued fraction coefficients after the leading 0. A391714

Numbers k such that 3·2^k - 7 is prime. A59747

Sums of Pythagorean sextuples in increasing order: The sums of sets of six natural numbers which correspond to the lengths of the edges of a tetrahedron whose four faces are all different Pythagorean triangles. A248548

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood. A272707

1, followed by list of numbers n such that the number of strong primes and the number of weak primes are equal at the n-th prime. A175102

[ (n+1)/(n-1) ] + [ (n+2)/(n-2) ] + ... + [ (2n-1)/1 ]. A22821

Primes associated with A175102. A175145