Properties of the Number 21485

Twenty-One Thousand Four Hundred Eighty-Five

Basics

Value: 21484 → 21485 → 21486

Parity: odd

Prime: No

Previous Prime: 21481

Next Prime: 21487

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 4297

Divisors: 1, 5, 4297, 21485

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111101101

Octal: 51755

Duodecimal: 10525

Hexadecimal: 53ed

Square: 461605225

Square Root: 146.57762448614045

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

Total sum T(n,k) of the sizes of all blocks with maximal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows. A270701

Total sum T(n,k) of the sizes of all blocks with minimal element k in all set partitions of {1,2,...,n}; triangle T(n,k), n>=1, 1<=k<=n, read by rows. A270702

Number T(n,k) of partitions of [n] having k blocks containing their own index when blocks are ordered with decreasing largest elements; triangle T(n,k), n>=0, 0<=k<=ceiling(n/2), read by rows. A350647

Total sum of the sizes of all blocks with maximal element 6 in all set partitions of {1,2,...,n}. A270760

Total sum of the sizes of all blocks with minimal element 4 in all set partitions of {1,2,...,n}. A270767

Numbers k such that the continued fraction for sqrt(k) has period 67. A20406

Numbers in A231626 but not in A343302; first of 5 consecutive deficient numbers in arithmetic progression with common difference > 1. A343303

Decimal part of cube root of a(n) starts with 8: first term of runs. A34134

Partial sums of A000960. A99074

Number of 0..n arrays x(0..3) of 4 elements with nondecreasing average value. A200764