2181103 has 4 divisors (see below), whose sum is σ = 2194648. Its totient is φ = 2167560.

The previous prime is 2181097. The next prime is 2181131. The reversal of 2181103 is 3011812.

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 2181103 - 2⁵ = 2181071 is a prime.

It is a Duffinian number.

2181103 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6528 + ... + 6853.

It is an arithmetic number, because the mean of its divisors is an integer number (548662).

2^2181103 is an apocalyptic number.

2181103 is a deficient number, since it is larger than the sum of its proper divisors (13545).

2181103 is a wasteful number, since it uses less digits than its factorization.

2181103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13544.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2181103 is about 1476.8557817201. The cubic root of 2181103 is about 129.6856903894.

Adding to 2181103 its reverse (3011812), we get a palindrome (5192915).

The spelling of 2181103 in words is "two million, one hundred eighty-one thousand, one hundred three".