Properties of the Number 99921

Ninety-Nine Thousand Nine Hundred Twenty-One

Basics

Value: 99920 → 99921 → 99922

Parity: odd

Prime: No

Previous Prime: 99907

Next Prime: 99923

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 19 × 1753

Divisors: 1, 3, 19, 57, 1753, 5259, 33307, 99921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000011001010001

Octal: 303121

Duodecimal: 499A9

Hexadecimal: 18651

Square: 9984206241

Square Root: 316.1028313697933

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

a(1) = 1, a(n) = 2·a(n-1) + a([n/2]). A33489

Sum of the first n strobogrammatic numbers. A230833

a(n) = 5·Fibonacci(n)². A99921

Number of n X 6 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors. A208312