Properties of the Number 10021

Ten Thousand Twenty-One

Basics

Value: 10020 → 10021 → 10022

Parity: odd

Prime: No

Previous Prime: 10009

Next Prime: 10037

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 11 × 911

Divisors: 1, 11, 911, 10021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011100100101

Octal: 23445

Duodecimal: 5971

Hexadecimal: 2725

Square: 100420441

Square Root: 100.1049449328054

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 whose sum of digits is 4. A52218

Numbers k such that k and k² use only the digits 0, 1, 2, 3 and 4. A136810

n is odd and sum of digits of n equals the numbers of divisors of n. A57532

Smallest number of each digital type. A266946

a(n) = A239460(n) / n². A239463

Numbers written in an alternating binary-then-ternary base. A109827

Primes in lunar arithmetic in base 3 written in base 3. A170806

Expansion of 1/((1 - x² - x³)² - 4·x⁵). A376723

a(1) = 1; a(n+1) = a(n) + product of nonzero digits of a(n) when written in base 3. Display sequence in base 3. A63112

Smallest n-digit squarefree number whose internal as well as external digits form a squarefree number greater than 1; or 0 if no such number exists. A77379