Properties of the Number 21625

Twenty-One Thousand Six Hundred Twenty-Five

Basics

Value: 21624 → 21625 → 21626

Parity: odd

Prime: No

Previous Prime: 21617

Next Prime: 21647

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 ³ × 173

Divisors: 1, 5, 25, 125, 173, 865, 4325, 21625

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010001111001

Octal: 52171

Duodecimal: 10621

Hexadecimal: 5479

Square: 467640625

Square Root: 147.05441169852742

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

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302741

Numbers m such that m = p² + k², with p > 0, where p = A007954(m) = the product of digits of m. A334557

Numbers k such that the continued fraction for sqrt(k) has period 79. A20418

Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302737

Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302743

Number of partitions of n minus the number of primes <= n. A183151

Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302735

Decimal expansion of 1/621. A21625