Properties of the Number 25221

Twenty-Five Thousand Two Hundred Twenty-One

Basics

Value: 25220 → 25221 → 25222

Parity: odd

Prime: No

Previous Prime: 25219

Next Prime: 25229

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 × 1201

Divisors: 1, 3, 7, 21, 1201, 3603, 8407, 25221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 110001010000101

Octal: 61205

Duodecimal: 12719

Hexadecimal: 6285

Square: 636098841

Square Root: 158.81120867243595

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

Triangle T(n,k): number of ways of partitioning the n-element multiset {1,1,2,3,...,n-1} into exactly k nonempty parts, n>=1 and 1<=k<=n. A241500

a(n) is the number of integers k less than 10ⁿ such that the decimal representation of k lacks the digits 1,2,3,4 and 5, at least one of digits 6,7 and at least one of digits 8,9. A126645

Number of ways of partitioning the multiset {1,1,2,3,...,n-1} into exactly five nonempty parts. A168585

Number of (w,x,y,z) with all terms in {1,...,n} and 2·w*x>3·y*z. A211922

(A192377)/2. A192378

Number of length n+5+1 0..5 arrays with every value 0..5 appearing at least once in every consecutive 5+2 elements, and new values 0..5 introduced in order. A242236

O.g.f. A(x) satisfies: [xⁿ] exp(n·A(x)) * (1 - n·x/(1-x)) = 0, for n > 0. A321087

T(n,k)=Number of length n+k+2 0..k arrays with every value 0..k appearing at least once in every consecutive k+3 elements, and new values 0..k introduced in order. A242322

a(n) = floor( tan(m*π/2) ), where m = 1 - 2^-n. A24810

[ 4th elementary symmetric function of sqrt(k+1) ], k = 1,2,...,n. A25221