Properties of the Number 21939

Twenty-One Thousand Nine Hundred Thirty-Nine

Basics

Value: 21938 → 21939 → 21940

Parity: odd

Prime: No

Previous Prime: 21937

Next Prime: 21943

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 71 × 103

Divisors: 1, 3, 71, 103, 213, 309, 7313, 21939

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010110110011

Octal: 52663

Duodecimal: 10843

Hexadecimal: 55b3

Square: 481319721

Square Root: 148.1181960462657

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

Triangle read by rows: T(n,k) = (1/4)*(A007318(n,k) - 6·A008292(n+1,k+1) + 9·A060187(n+1,k+1)). A142175

Triangle T(n,k), read by rows n>=0 with terms k=1..3ⁿ, where row n lists the coefficients in the n-th iteration of x*(1+x)². A166888

Partial sums of A147562. A272928

Numbers k such that (5·10^k + 97)/3 is prime. A294921

Decimal expansion of 1/935. A21939