2128361 has 4 divisors (see below), whose sum is σ = 2240400. Its totient is φ = 2016324.

The previous prime is 2128333. The next prime is 2128381. The reversal of 2128361 is 1638212.

2128361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2128381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55991 + ... + 56028.

It is an arithmetic number, because the mean of its divisors is an integer number (560100).

2^2128361 is an apocalyptic number.

It is an amenable number.

2128361 is a deficient number, since it is larger than the sum of its proper divisors (112039).

2128361 is a wasteful number, since it uses less digits than its factorization.

2128361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112038.

The product of its digits is 576, while the sum is 23.

The square root of 2128361 is about 1458.8903317248. The cubic root of 2128361 is about 128.6318248285.

It can be divided in two parts, 21 and 28361, that added together give a palindrome (28382).

The spelling of 2128361 in words is "two million, one hundred twenty-eight thousand, three hundred sixty-one".