2171885187 has 8 divisors (see below), whose sum is σ = 2913613504. Its totient is φ = 1439040168.

The previous prime is 2171885173. The next prime is 2171885189. The reversal of 2171885187 is 7815881712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2171885187 - 2¹⁰ = 2171884163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171885189) 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 7 ways as a sum of consecutive naturals, for example, 2220253 + ... + 2221230.

It is an arithmetic number, because the mean of its divisors is an integer number (364201688).

Almost surely, 2^2171885187 is an apocalyptic number.

2171885187 is a deficient number, since it is larger than the sum of its proper divisors (741728317).

2171885187 is a wasteful number, since it uses less digits than its factorization.

2171885187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441649.

The product of its digits is 250880, while the sum is 48.

The square root of 2171885187 is about 46603.4890002884. The cubic root of 2171885187 is about 1295.0273915784.

The spelling of 2171885187 in words is "two billion, one hundred seventy-one million, eight hundred eighty-five thousand, one hundred eighty-seven".