Properties of the Number 21342

Twenty-One Thousand Three Hundred Forty-Two

Basics

Value: 21341 → 21342 → 21343

Parity: even

Prime: No

Previous Prime: 21341

Next Prime: 21347

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3557

Divisors: 1, 2, 3, 6, 3557, 7114, 10671, 21342

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001101011110

Octal: 51536

Duodecimal: 10426

Hexadecimal: 535e

Square: 455480964

Square Root: 146.08901396066713

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 ways to toss a coin n times and not get a run of five. A135492

Numbers which are the sum of their proper divisors containing the digit 7. A59466

McKay-Thompson series of class 45b for Monster. A58686

Number of function calls of the first kind required to compute ack(3,n), where ack denotes the Ackermann function. A304370

a(n) = ∑_j=1..n ∑_k=1..n τ(j·k). A372674

a(n) is the number of optimal strategies for Player I in the Penney-Ante game with strings of length n. A344903

Partial sums of economical numbers A046759. A172460

Ulam numbers k such that 4·k and 16·k are also Ulam numbers. A287634

Triangular numbers k such that φ(k) is also a triangular number, where φ(k) is the Euler totient function (A000010). A287472

Decimal expansion of 1/338. A21342