2181136172 has 12 divisors (see below), whose sum is σ = 3859876440. Its totient is φ = 1078314336.

The previous prime is 2181136123. The next prime is 2181136187. The reversal of 2181136172 is 2716311812.

It is an unprimeable number.

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, 3063038 + ... + 3063749.

It is an arithmetic number, because the mean of its divisors is an integer number (321656370).

Almost surely, 2^2181136172 is an apocalyptic number.

It is an amenable number.

2181136172 is a deficient number, since it is larger than the sum of its proper divisors (1678740268).

2181136172 is a wasteful number, since it uses less digits than its factorization.

2181136172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6126880 (or 6126878 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 2181136172 is about 46702.6356001457. The cubic root of 2181136172 is about 1296.8634784147.

Adding to 2181136172 its reverse (2716311812), we get a palindrome (4897447984).

The spelling of 2181136172 in words is "two billion, one hundred eighty-one million, one hundred thirty-six thousand, one hundred seventy-two".