Properties of the Number 70021

Seventy Thousand Twenty-One

Basics

Value: 70020 → 70021 → 70022

Parity: odd

Prime: No

Previous Prime: 70019

Next Prime: 70039

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 7 ² × 1429

Divisors: 1, 7, 49, 1429, 10003, 70021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001000110000101

Octal: 210605

Duodecimal: 34631

Hexadecimal: 11185

Square: 4902940441

Square Root: 264.6148144001012

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

E.g.f. satisfies A(x) = (exp(x) - 1) * exp(3·A(x)). A357336

Composite numbers k such that b^k == b (mod σ(k)) for every integer b. A277286

Reflection of the concatenation of the previous two terms minus the previous term. A345143

1/n has period 1 in base 10 (but not terminating). A70021

G.f. satisfies: A(x,y) = 1 + ∑_n>=1 xⁿ*y·A(x,y)ⁿ/(1 - y·A(x,y)^2·n), where A(x,y) = 1 + ∑_n>=1,k>=1 T(n,k)*xⁿ*y^k; here the coefficients T(n,k) form a square array and are read by antidiagonals. A192404