Properties of the Number 21725

Twenty-One Thousand Seven Hundred Twenty-Five

Basics

Value: 21724 → 21725 → 21726

Parity: odd

Prime: No

Previous Prime: 21713

Next Prime: 21727

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 ² × 11 × 79

Divisors: 1, 5, 11, 25, 55, 79, 275, 395, 869, 1975

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010011011101

Octal: 52335

Duodecimal: 106A5

Hexadecimal: 54dd

Square: 471975625

Square Root: 147.39402972983675

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 k!!! + 1 is prime (0 is included by convention). A37083

Indices of primes in sequence defined by A(0) = 39, A(n) = 10·A(n-1) - 11 for n > 0. A101843

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MOR = Mordenite Na8[Al8Si40O96].24H2O starting with a T1 atom. A19179

Minimum positive integer solution·of equation n=x*(x+1)/(t*(t+1)); that is, ratio of product of two consecutive integers divided by product of two consecutive integers. Here n is a nonsquare integer (see A000037). A166477

Number of length 2+5 0..n arrays with some disjoint triples in each consecutive six terms having the same sum. A248070

Decimal expansion of 1/721. A21725