2181106 has 4 divisors (see below), whose sum is σ = 3271662. Its totient is φ = 1090552.

The previous prime is 2181097. The next prime is 2181131. The reversal of 2181106 is 6011812.

2181106 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.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 982081 = 1095^2 + 991^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 545275 + ... + 545278.

2^2181106 is an apocalyptic number.

2181106 is a deficient number, since it is larger than the sum of its proper divisors (1090556).

2181106 is a wasteful number, since it uses less digits than its factorization.

2181106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090555.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 2181106 is about 1476.8567973910. The cubic root of 2181106 is about 129.6857498482.

Adding to 2181106 its reverse (6011812), we get a palindrome (8192918).

The spelling of 2181106 in words is "two million, one hundred eighty-one thousand, one hundred six".