Properties of the Number 21351

Twenty-One Thousand Three Hundred Fifty-One

Basics

Value: 21350 → 21351 → 21352

Parity: odd

Prime: No

Previous Prime: 21347

Next Prime: 21377

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 11 × 647

Divisors: 1, 3, 11, 33, 647, 1941, 7117, 21351

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001101100111

Octal: 51547

Duodecimal: 10433

Hexadecimal: 5367

Square: 455865201

Square Root: 146.11981385151023

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

Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition). A333031

a(n) = (1/3)*A290906(n). A290907

Numbers k that divide prime(k²) - 1. A67852

Number of partitions of n such that 5*(greatest part) >= (number of parts). A347869

a(n) = ∑_{k = n..2·n+1} k². A299646

Numbers that are the product of 3 distinct primes a,b and c, such that a+b+c, a²+b²+c² and a³+b³+c³ are prime numbers. A176911

Square array read by antidiagonals: T(n,m) (n>=1, m>=0) is the number of partitions of mn that are the sum of m not necessarily distinct partitions of n. A213086

Decimal expansion of 1/347. A21351

Number of 5X(n+1) 0..2 arrays with every 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors and no 2 X 2 subblock having the same number of counterclockwise edge increases as its vertical neighbors. A205740