2123 has 4 divisors (see below), whose sum is σ = 2328. Its totient is φ = 1920.
The previous prime is 2113. The next prime is 2129. The reversal of 2123 is 3212.
2123 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 2123 - 28 = 1867 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
It is a plaindrome in base 6 and base 12.
It is a nialpdrome in base 13.
It is a self number, because there is not a number n which added to its sum of digits gives 2123.
It is not an unprimeable number, because it can be changed into a prime (2129) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86 + ... + 107.
It is an arithmetic number, because the mean of its divisors is an integer number (582).
22123 is an apocalyptic number.
2123 is a deficient number, since it is larger than the sum of its proper divisors (205).
2123 is a wasteful number, since it uses less digits than its factorization.
2123 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 204.
The product of its digits is 12, while the sum is 8.
The square root of 2123 is about 46.0760241340. The cubic root of 2123 is about 12.8523733044.
Adding to 2123 its reverse (3212), we get a palindrome (5335).
Subtracting 2123 from its reverse (3212), we obtain a square (1089 = 332).
It can be divided in two parts, 212 and 3, that multiplied together give a palindrome (636).
The spelling of 2123 in words is "two thousand, one hundred twenty-three", and thus it is an iban number.
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