2128942187 has 4 divisors (see below), whose sum is σ = 2129050176. Its totient is φ = 2128834200.

The previous prime is 2128942183. The next prime is 2128942217. The reversal of 2128942187 is 7812498212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2128942187 - 2² = 2128942183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128942183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15068 + ... + 66969.

It is an arithmetic number, because the mean of its divisors is an integer number (532262544).

Almost surely, 2^2128942187 is an apocalyptic number.

2128942187 is a deficient number, since it is larger than the sum of its proper divisors (107989).

2128942187 is an equidigital number, since it uses as much as digits as its factorization.

2128942187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107988.

The product of its digits is 129024, while the sum is 44.

The square root of 2128942187 is about 46140.4614953080. The cubic root of 2128942187 is about 1286.4353216897.

The spelling of 2128942187 in words is "two billion, one hundred twenty-eight million, nine hundred forty-two thousand, one hundred eighty-seven".