Properties of the Number 21598

Twenty-One Thousand Five Hundred Ninety-Eight

Basics

Value: 21597 → 21598 → 21599

Parity: even

Prime: No

Previous Prime: 21589

Next Prime: 21599

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 10799

Divisors: 1, 2, 10799, 21598

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010001011110

Octal: 52136

Duodecimal: 105BA

Hexadecimal: 545e

Square: 466473604

Square Root: 146.9625802713058

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

Numbers whose least quadratic nonresidue (A020649) is 19. A25027

Consecutive terms of A065966 which are also consecutive integers. A65976

(2n+1)-digit anti-palindromic numbers or numberdromes, whose first and last digits add to ten, second and next-to-last add to ten and so on with the central digit a 5. A93472

Numbers n such that σ(n) and σ(σ(n)) are both perfect squares. A134263

Number of partitions of n into parts not of the form 11k, 11k+4 or 11k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 4 are greater than 1. A35947

Numbers k such that the reverse of the first k digits in the decimal expansion of π forms a prime. A282183

a(n) is the maximal sum of the elements of A³ where A is a square matrix of size n whose elements are a permutation of {1, 2, ..., n²}. A369396

Decimal expansion of 1/594. A21598