Properties of the Number 22721

Twenty-Two Thousand Seven Hundred Twenty-One

Basics

Value: 22720 → 22721 → 22722

Parity: odd

Prime: Yes

Previous Prime: 22717

Next Prime: 22727

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 22721

Divisors: 1, 22721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101100011000001

Octal: 54301

Duodecimal: 11195

Hexadecimal: 58c1

Square: 516243841

Square Root: 150.7348665704123

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) = ∑_k=1..n C(n, floor((n-k)/k)). A273160

Primes of form a²+b² such that a⁴+b⁴ and a⁸+b⁸ are primes. A182313

Prime numbers whose central digit equals the sum of the other digits. A235119

Total number of divisors d of m (counted with multiplicity), such that the prime signature of d is a partition of three and m runs through the set of least numbers whose prime signature is a partition of n. A309693

Primes p such that p+1 is palindromic. A28981

Number of strings of numbers x(i=1..8) in 0..n with sum i²*x(i)² equal to n²*64. A184246

Prime-Indexed Primes (PIPs) k such that the sum of all PIPs <= k is a prime. A261148

Primes p such that if q is the next prime, p+A004086(q) and q+A004086(p) are prime. A351728

a(n) = ∑_k=0..n (-1)^k*A001595(k)². A375501

Primes p from A031924 such that A052180(primepi(p)) = 31. A52237