Properties of the Number 21701

Twenty-One Thousand Seven Hundred One

Basics

Value: 21700 → 21701 → 21702

Parity: odd

Prime: Yes

Previous Prime: 21683

Next Prime: 21713

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 21701

Divisors: 1, 21701

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010011000101

Octal: 52305

Duodecimal: 10685

Hexadecimal: 54c5

Square: 470933401

Square Root: 147.31259280862582

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

Mersenne exponents: primes p such that 2^p - 1 is prime. Then 2^p - 1 is called a Mersenne prime. A43

Ordered hypotenuses of primitive Pythagorean triangles having legs that add up to a square. A88319

Decimal expansion of 2²¹⁷⁰¹ - 1, the 25th Mersenne prime A000668(25). A275982

Primes p such that q = p+d (with d >= 6) is the next prime and both p and q are Sophie Germain primes. A128825

Primes p (A000043) such that 2^p-1 is prime (A000668) and congruent to 31 mod 6!. A145041

Numbers m such that 2^m + (-1)^m is prime. A285929

Numbers at the start of a run of 2 or more consecutive primes that are Sophie Germain primes. A339474

Smallest prime divisor of (n-th primorial - (n+1)-st prime). A65314

Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime. A255967

Numbers at the start of a run of exactly 2 consecutive primes that are Sophie Germain primes. A339475