Properties of the Number 11221

Eleven Thousand Two Hundred Twenty-One

Basics

Value: 11220 → 11221 → 11222

Parity: odd

Prime: No

Previous Prime: 11213

Next Prime: 11239

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 7 ² × 229

Divisors: 1, 7, 49, 229, 1603, 11221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101111010101

Octal: 25725

Duodecimal: 65B1

Hexadecimal: 2bd5

Square: 125910841

Square Root: 105.92922165295089

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 that contain only 1's and 2's. Nonempty binary strings of length n in lexicographic order. A7931

Multiples of 7 whose sum of digits is equal to 7. A63416

Centered 20-gonal (or icosagonal) numbers. A69133

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

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

Composites whose prime factorization in base 4 is an anagram of the number in base 4. A260048

Integers whose decimal expansion start with 1, do not contain zeros and each successive digit to the right is at most one greater than the previous digit. A71159

Consider the Post tag system described in A284116 (but adapted to the alphabet {1,2}) ; sequence lists the words that terminate in the empty word. A289675

The word 1 belongs to the sequence, and whenever a word w belongs to the sequence, then the words consisting of 1's and 2's whose run lengths transform equals w also belong to the sequence. A376637

Numbers of rank 11 in the poset of lunar numbers. A191753