Properties of the Number 21471

Twenty-One Thousand Four Hundred Seventy-One

Basics

Value: 21470 → 21471 → 21472

Parity: odd

Prime: No

Previous Prime: 21467

Next Prime: 21481

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 17 × 421

Divisors: 1, 3, 17, 51, 421, 1263, 7157, 21471

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111011111

Octal: 51737

Duodecimal: 10513

Hexadecimal: 53df

Square: 461003841

Square Root: 146.52986043806908

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 integer partitions of n such that it is not possible to choose a different prime factor of each part. A370593

a(n) = ∑_i=0..n ∑_j=0..n (-1)^i+j * (i+j)!/(i!j!). A120305

Integers of the form 8k + 7 that can be written as a sum of four distinct squares of the form m, m + 2, m + 3, m + 4, where m == 2 (mod 4). A243581

Sequence of which A078783 is the Recamán transform. A117073

Sums of members of groups in A076063. A76066

Number of integer partitions with sum < n whose distinct parts cannot be linearly combined using all positive coefficients to obtain n. A365323

Expansion of (1/x) * Series_Reversion( x * (1-x) * (1-x-x⁵) ). A368933

Numbers k such that prime(k) == 1 (mod σ(k)). A67697

Odd composite numbers such that the sum of any two terms, plus 1, is a prime. A133762

E.g.f. A(x) satisfies: d/dx A(x) = 1 + A(x·exp(-x)). A307135