Properties of the Number 21430

Twenty-One Thousand Four Hundred Thirty

Basics

Value: 21429 → 21430 → 21431

Parity: even

Prime: No

Previous Prime: 21419

Next Prime: 21433

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 2143

Divisors: 1, 2, 5, 10, 2143, 4286, 10715, 21430

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001110110110

Octal: 51666

Duodecimal: 1049A

Hexadecimal: 53b6

Square: 459244900

Square Root: 146.38989036132241

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 free polyominoes in {4,5} tessellation of the hyperbolic plane. A119611

Number of regular tetrahedra in an n-node-per-edge tetrahedral grid. A269747

T(n,k)=Number of nXk 0..2 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279534

Number of (n+4)X5 binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s. A183458

Let an integer with k+1 digits as n = d(k)*10^k + d(k-1)*10^k-1 + ... + d(0)*10⁰ and consider the transform T(n) = k·10^d(k) + (k-1)*10^d(k-1) + ... + 0·10^d(0). a(n) gives the fixed points of the transform T(n). A226767

Number of nX3 0..2 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279531

Number of nX4 0..2 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279532

Number of partitions of n into parts not of the form 25k, 25k+11 or 25k-11. Also number of partitions with at most 10 parts of size 1 and differences between parts at distance 11 are greater than 1. A36010

Least b > 1 such that (b^prime(n²) - 1)/(b^prime(n) - 1) is prime. A353101

Position of the first permutation of { 0 .. n-1 } occurring in the digits of π written in base n. A307581