Properties of the Number 21389

Twenty-One Thousand Three Hundred Eighty-Nine

Basics

Value: 21388 → 21389 → 21390

Parity: odd

Prime: No

Previous Prime: 21383

Next Prime: 21391

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 73 × 293

Divisors: 1, 73, 293, 21389

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001110001101

Octal: 51615

Duodecimal: 10465

Hexadecimal: 538d

Square: 457489321

Square Root: 146.24978632463024

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

Numbers of the form prime(n)*(prime(n)-1)/4. A171555

Number of integer partitions of n with some part that can be written as a nonnegative linear combination of the other distinct parts. A365068

Numbers n such that A229964(n) = 3. A229966

Records in A353717. A353722

Expansion of 1/(1-x³-x⁴-x⁵-x⁶-x⁷-x⁸-x⁹-x¹⁰). A17823

a(n) = one-half of the number of cells in the central rectangle of the graph described in row 2n+1 of A333288. A337640

Base-8 palindromes that start with 5. A43025

Numbers divisible by at least two of their digits, different and >1. A187516

The minimal Skewes number for prime n-tuplets, choosing the n-tuplet with latest occurrence of the first sign change relative to the Hardy-Littlewood prediction when more than one type of n-tuplets exists (A083409(n)>1) for the given n. A332493

Decimal expansion of 1/385. A21389