ℕ atory
Play Now

Properties of the Number -221221

Two Hundred Twenty-One Thousand Two Hundred Twenty-One

Basics

Value: -221222 → -221221 → -221220

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 7 × 11 × 13 2 × 17

Divisors: 1, 7, 11, 13, 17, 77, 91, 119, 143, 169

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

9108 Try Today's Challenge

Representations

Binary: -110110000000100101

Octal: -660045

Duodecimal: -A8031

Hexadecimal: -36025

Square: 48938730841

Square Root: 470.34136539326414

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

Non-primitive words on {1,2,3}. A239018
List of imprimitive words over the alphabet {1,2}. A213972
Shortest (x+1,2x)-code of n. A233135
Numbers such that each decimal digit d (for all d in the range 1 <= d <= 9) occurs only in runs of length exactly d. A140057
Integers k such that k = Sum k/(pi + j), where pi are the prime factors of k (with multiplicity). Case j = -5. A380927
Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,2,1. A37567
k th digit of a(n) = number of different digits within 2 places of k (not including k). A39987
n expressed in Fibonacci binary-like number system using only 1's and 2's. A108960
Numbers for which the sum of reciprocals of square of digits is an integer. A182452