Properties of the Number 21222

Twenty-One Thousand Two Hundred Twenty-Two

Basics

Value: 21221 → 21222 → 21223

Parity: even

Prime: No

Previous Prime: 21221

Next Prime: 21227

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ⁴ × 131

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 81, 131

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011100110

Octal: 51346

Duodecimal: 10346

Hexadecimal: 52e6

Square: 450373284

Square Root: 145.67772650614782

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

n written in fractional base 3/2. A24629

Numbers that are the sum of 7 positive 9th powers. A3396

Numbers which are divisible by prime(d) for all digits d in their decimal representation. A256786

a(n) is the smallest positive multiple of n whose decimal digits are all 0, 1 or 2. A181060

Base 4 perfect digital invariants (written in base 10): numbers equal to the sum of the k-th powers of their base-4 digits, for some k. A162219

List of primitive words over the alphabet {1,2}. A213969

Partition the concatenation 1234567...of natural numbers into successive strings which are multiples of 6, all different and > 6. (0 never taken as the most significant digit.) A77299

a(n) is the largest integer with n digits in base 3/2. A304024

Put the natural numbers together without spaces and read them five at a time advancing one space each time. A193493

Number of integer partitions of n for which the parts have the same median as the multiplicities. A360456