2181773108 has 12 divisors (see below), whose sum is σ = 3842423172. Its totient is φ = 1083937920.

The previous prime is 2181773107. The next prime is 2181773147. The reversal of 2181773108 is 8013771812.

It can be written as a sum of positive squares in 2 ways, for example, as 969201424 + 1212571684 = 31132^2 + 34822^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181773101) 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, 1736453 + ... + 1737708.

It is an arithmetic number, because the mean of its divisors is an integer number (320201931).

Almost surely, 2^2181773108 is an apocalyptic number.

It is an amenable number.

2181773108 is a deficient number, since it is larger than the sum of its proper divisors (1660650064).

2181773108 is a wasteful number, since it uses less digits than its factorization.

2181773108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3474322 (or 3474320 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 2181773108 is about 46709.4541608013. The cubic root of 2181773108 is about 1296.9897029417.

The spelling of 2181773108 in words is "two billion, one hundred eighty-one million, seven hundred seventy-three thousand, one hundred eight".