Properties of the Number 21023

Twenty-One Thousand Twenty-Three

Basics

Value: 21022 → 21023 → 21024

Parity: odd

Prime: Yes

Previous Prime: 21019

Next Prime: 21031

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 21023

Divisors: 1, 21023

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 101001000011111

Octal: 51037

Duodecimal: 101BB

Hexadecimal: 521f

Square: 441966529

Square Root: 144.9931032842597

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

Primes of the form k² - 2. A28871

Triangle read by rows: T(n,k) is the k-th generalized Eulerian number of order n and degree 4, n >= 1. A211234

Numbers n such that Q(sqrt(n)) has class number 9. A218041

Primes equal to a heptagonal number plus 1. A285791

Primes equal to a centered heptagonal number plus 1. A285811

Primes that remain prime through 3 iterations of function f(x) = 3x + 4. A23278

Row sums of triangle A054453. A54455

Primes that are 2 less than a perfect power m^k, k >= 2. A94786

a(n+1) is the smallest prime > a(n) such that the digits of a(n) are all (with multiplicity) contained in the digits of a(n+1), with a(1)=2. A242904

Table read by rows: list of prime 5-tuples of the form (p, p+2, p+6, p+8, p+12). A270998