Properties of the Number 21221

Twenty-One Thousand Two Hundred Twenty-One

Basics

Value: 21220 → 21221 → 21222

Parity: odd

Prime: Yes

Previous Prime: 21211

Next Prime: 21227

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 21221

Divisors: 1, 21221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011100101

Octal: 51345

Duodecimal: 10345

Hexadecimal: 52e5

Square: 450330841

Square Root: 145.67429423202984

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 having only {1, 2, 9} as digits. A385776

n written in fractional base 3/2. A24629

Numbers that are the sum of 11 positive 8th powers. A3389

Numbers that are the sum of 6 positive 9th powers. A3395

Primes having only {0, 1, 2} as digits. A36953

Number of primes less than 10000n. A38813

Primes that contain digits 1 and 2 only. A20450

Primes having only {1, 2, 4} as digits. A260267

Prime numbers such that sum of digits equals product of digits. A66306

Primes with digital product = 8. A107694