2171181612 has 24 divisors (see below), whose sum is σ = 5071628800. Its totient is φ = 722936016.

The previous prime is 2171181589. The next prime is 2171181637. The reversal of 2171181612 is 2161811712.

It is a self number, because there is not a number n which added to its sum of digits gives 2171181612.

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 7 ways as a sum of consecutive naturals, for example, 87412 + ... + 109467.

Almost surely, 2^2171181612 is an apocalyptic number.

It is an amenable number.

2171181612 is an abundant number, since it is smaller than the sum of its proper divisors (2900447188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2171181612 is a wasteful number, since it uses less digits than its factorization.

2171181612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197805 (or 197803 counting only the distinct ones).

The product of its digits is 1344, while the sum is 30.

The square root of 2171181612 is about 46595.9398660441. The cubic root of 2171181612 is about 1294.8875365332.

The spelling of 2171181612 in words is "two billion, one hundred seventy-one million, one hundred eighty-one thousand, six hundred twelve".