Properties of the Number 21103

Twenty-One Thousand One Hundred Three

Basics

Value: 21102 → 21103 → 21104

Parity: odd

Prime: No

Previous Prime: 21101

Next Prime: 21107

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 47 × 449

Divisors: 1, 47, 449, 21103

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001101111

Octal: 51157

Duodecimal: 10267

Hexadecimal: 526f

Square: 445336609

Square Root: 145.26871652217486

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 k such that σ(φ(k)) - φ(σ(k)) is nonzero and divisible by σ(k), that is A065395(k)/A000203(k) is a nonzero integer. A92588

4-Smith numbers. A103125

Number of n-node rooted trees of height 5. A342

Numbers n whose sum of anti-divisors is a permutation of their digits. A258786

Numbers k such that σ(k) - k - 1 is a perfect number. A293992

Number of two-connected (or biconnected) planar graphs with n nodes. A21103