Properties of the Number 21253

Twenty-One Thousand Two Hundred Fifty-Three

Basics

Value: 21252 → 21253 → 21254

Parity: odd

Prime: No

Previous Prime: 21247

Next Prime: 21269

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 53 × 401

Divisors: 1, 53, 401, 21253

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100000101

Octal: 51405

Duodecimal: 10371

Hexadecimal: 5305

Square: 451690009

Square Root: 145.7840869230932

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 j in pairs (j,k), with j <> k +- 1, such that the sum of their cubes is equal to a centered cube number. A352135

Semiprimes in A056108. A113527

Numbers that are the sum of eight fourth powers in exactly eight ways. A345840

Numbers n such that primorial(n)/2 + 8 is prime. A139441

Greatest number having exactly n representations as ab+ac+bc with 0 < a < b < c. A94377

Expansion of ∏_k>=1 (1 + (x*(1 - x))^k). A307501

Sum of the largest parts in the partitions of 3n into 3 parts. A236370

a(n) is the least integer k such that k/Fibonacci(n) > π. A293678

a(n) is the integer k that minimizes |k/Fibonacci(n) - π|. A293679

Expansion of 1/sqrt((1-x³)² - 4·x⁴). A383571