2321
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2544
- Proper Divisor Sum (Aliquot Sum)
- 223
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2100
- Möbius Function
- 1
- Radical
- 2321
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 32
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of positive integers <= 2^n of the form 3*x^2 + 4*y^2.at n=14A000049
- Maximal number of states in the minimal deterministic finite automaton accepting a language over a binary alphabet consisting of some words of length n.at n=14A000802
- Numbers that are the sum of 11 positive 6th powers.at n=35A003367
- Numbers that are the sum of 8 positive 7th powers.at n=10A003375
- a(n) = floor(1000*log_2(n)).at n=4A004265
- Coordination sequence T3 for Zeolite Code GOO.at n=33A008113
- Coordination sequence T2 for Zeolite Code -ROG.at n=36A009860
- Integers that are squarefree and also the sum of first k squarefrees for some k.at n=32A013932
- Positive integers n such that 2^n == 2^11 (mod n).at n=41A015935
- Pseudoprimes to base 23.at n=25A020151
- Pseudoprimes to base 71.at n=23A020199
- Strong pseudoprimes to base 71.at n=6A020297
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=16A020383
- Index of 5^n within sequence of numbers of form 2^i * 5^j.at n=44A022334
- Sum of digits in n-th term of A022470.at n=24A022475
- Numbers k such that Fibonacci(k) == 89 (mod k).at n=31A023182
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 20 ones.at n=34A031788
- Numbers whose base-14 expansion has no run of digits with length < 2.at n=23A033027
- Number of symmetric n X 4 crossword puzzle grids.at n=6A034186
- Composite numbers k such that the digits of the prime factors of k are either 1 or 2.at n=26A036302