Properties of the Number 1021

One Thousand Twenty-One

Basics

Value: 1020 → 1021 → 1022

Parity: odd

Prime: Yes

Previous Prime: 1019

Next Prime: 1031

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 1021

Divisors: 1, 1021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111111101

Octal: 1775

Duodecimal: 711

Hexadecimal: 3fd

Square: 1042441

Square Root: 31.953090617340916

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

Greater of twin primes. A6512

Numbers in base 3. A7089

Integers written in factorial base. A7623

Emirps (primes whose reversal is a different prime). A6567

n written in primorial base. A49345

Primes congruent to 1 (mod 12). A68228

Primes of the form 10·n+1. A30430

Primes whose reversal in base 10 is also prime (called "palindromic primes" by David Wells, although that name usually refers to A002385). Also called reversible primes. A7500

Y-toothpick sequence (see Comments lines for definition). A160120

Primes whose decimal representation is a valid number in base 4 and interpreted as such is again a prime. A90707