Properties of the Number 21961

Twenty-One Thousand Nine Hundred Sixty-One

Basics

Value: 21960 → 21961 → 21962

Parity: odd

Prime: Yes

Previous Prime: 21943

Next Prime: 21977

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 21961

Divisors: 1, 21961

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101010111001001

Octal: 52711

Duodecimal: 10861

Hexadecimal: 55c9

Square: 482285521

Square Root: 148.1924424523734

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

Primes whose base-3 representation also is the base-2 representation of a prime. A235265

Balanced primes of order four. A82079

Number of non-isomorphic multiset partitions of weight n into singletons or strict pairs. A339888

Primes of form n² + 20736. A256840

Numbers whose least quadratic nonresidue (A020649) is 17. A25026

Next prime after n³. A14220

Primes of the form 2·n² + 78·n + 37. A217501

Integers k such that A166100(k)/A005408(k) is not an integer. A166101

Primes in A003154. A83577

Smallest prime that is simultaneously of forms x² + m·y² for m = 1, ..., n. A28372