2181205 has 16 divisors (see below), whose sum is σ = 2943360. Its totient is φ = 1539648.

The previous prime is 2181203. The next prime is 2181209. The reversal of 2181205 is 5021812.

It is a cyclic number.

It is not a de Polignac number, because 2181205 - 2¹ = 2181203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766 + ... + 2224.

It is an arithmetic number, because the mean of its divisors is an integer number (183960).

2^2181205 is an apocalyptic number.

It is an amenable number.

2181205 is a deficient number, since it is larger than the sum of its proper divisors (762155).

2181205 is a wasteful number, since it uses less digits than its factorization.

2181205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2181205 is about 1476.8903141398. The cubic root of 2181205 is about 129.6877119559.

The spelling of 2181205 in words is "two million, one hundred eighty-one thousand, two hundred five".