Properties of the Number 80021

Eighty Thousand Twenty-One

Basics

Value: 80020 → 80021 → 80022

Parity: odd

Prime: Yes

Previous Prime: 79999

Next Prime: 80039

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 80021

Divisors: 1, 80021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011100010010101

Octal: 234225

Duodecimal: 3A385

Hexadecimal: 13895

Square: 6403360441

Square Root: 282.8798331447472

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

Primes p with f(p), f(f(p)) and f(f(f(p))) all prime, where f(n) = prime(n) - n + 1. A235934

Numbers k such that 31·2^k-1 is prime. A50541

McKay-Thompson series of class 28A for Monster. A58606

Smallest prime in which the n-th significant digit is an 8. A69596

Number of ways of dividing an n X 3 rectangle into integer-sided rectangles, up to rotations and reflections. A361525

Triangular array T(h,k) for 0 <= k <= h read by rows: T(h,k) = number of binary Lyndon words with k ones and h-k zeros. A51168

Number of rooted planar trees with n non-root nodes: circularly cycling the subtrees at the root gives equivalent trees. A3239

Number of Latin squares of order n; or labeled quasigroups. A2860

Triangle read by rows: T(n,k) is the (n,k)-th circular binomial coefficient, where 0 <= k <= n. A47996

Triangle T(n,k) read by rows: the number of compositions of n into k parts, modulo cyclic shifts. A37306