Properties of the Number 21953

Twenty-One Thousand Nine Hundred Fifty-Three

Basics

Value: 21952 → 21953 → 21954

Parity: odd

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 29 × 757

Divisors: 1, 29, 757, 21953

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010111000001

Octal: 52701

Duodecimal: 10855

Hexadecimal: 55c1

Square: 481934209

Square Root: 148.16544806398016

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

a(n) = n³ + 1. A1093

Semiprimes of the form k³ + 1. A237040

Number of maximal sum-free and product-free subsets of {1..n}. A326497

Number of overpartitions of n minus the number of partitions of n. A230441

Numbers which are the sum of two positive cubes and divisible by 29. A224483

Number of (i,j,k) in {1,2,...,n}³ such that gcd(n,i) = gcd(n,j) = gcd(n,k). A338997

a(n) = 28·n² + 1. A158556

Numbers n such that gcd(φ(n), n-1) > λ(n). A283656

a(n) = ∑_d∣n sigma_d(d)ⁿ. A359052

a(n) = ∑_d∣n sigma_d(d)^d. A359054