Properties of the Number 2721

Two Thousand Seven Hundred Twenty-One

Basics

Value: 2720 → 2721 → 2722

Parity: odd

Prime: No

Previous Prime: 2719

Next Prime: 2729

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 907

Divisors: 1, 3, 907, 2721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101010100001

Octal: 5241

Duodecimal: 16A9

Hexadecimal: aa1

Square: 7403841

Square Root: 52.16320542297991

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

D-toothpick sequence of the second kind (see Comments lines for definition). A194270

a(n) = least k such that the remainder when 14^k is divided by k is n. A128154

Numbers k such that k, k+1 and k+2 are products of two primes. A56809

Bessel polynomials y_n(x) (see A001498) evaluated at 2. A1517

Numerators of convergents to e. A7676

a(n) = T(n, n-4), T given by A026519. Also a(n) = number of integer strings s(0), ..., s(n), counted by T, such that s(n) = 4. A26524

Smallest of three consecutive squarefree numbers k, k+1, k+2 of the form p·q where p and q are distinct primes. A39833

Values of n such that n²-2 and n²+2 are both prime. A108701

Centered 20-gonal (or icosagonal) numbers. A69133

Concentric 10-gonal numbers. A195142