2128710909 has 8 divisors (see below), whose sum is σ = 3056610592. Its totient is φ = 1309975920.

The previous prime is 2128710901. The next prime is 2128710977. The reversal of 2128710909 is 9090178212.

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

It is not a de Polignac number, because 2128710909 - 2³ = 2128710901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 54582331 = 2128710909 / (2 + 1 + 2 + 8 + 7 + 1 + 0 + 9 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128710901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27291127 + ... + 27291204.

It is an arithmetic number, because the mean of its divisors is an integer number (382076324).

Almost surely, 2^2128710909 is an apocalyptic number.

It is an amenable number.

2128710909 is a deficient number, since it is larger than the sum of its proper divisors (927899683).

2128710909 is a wasteful number, since it uses less digits than its factorization.

2128710909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54582347.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 2128710909 is about 46137.9551887597. The cubic root of 2128710909 is about 1286.3887359620.

The spelling of 2128710909 in words is "two billion, one hundred twenty-eight million, seven hundred ten thousand, nine hundred nine".