2129940128 has 24 divisors (see below), whose sum is σ = 4414021920. Its totient is φ = 1008918720.

The previous prime is 2129940121. The next prime is 2129940173. The reversal of 2129940128 is 8210499212.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 2129940091 and 2129940100.

It is not an unprimeable number, because it can be changed into a prime (2129940121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750988 + ... + 1752203.

It is an arithmetic number, because the mean of its divisors is an integer number (183917580).

Almost surely, 2^2129940128 is an apocalyptic number.

It is an amenable number.

2129940128 is an abundant number, since it is smaller than the sum of its proper divisors (2284081792).

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

2129940128 is a wasteful number, since it uses less digits than its factorization.

2129940128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503220 (or 3503212 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 2129940128 is about 46151.2743919385. The cubic root of 2129940128 is about 1286.6362956788.

The spelling of 2129940128 in words is "two billion, one hundred twenty-nine million, nine hundred forty thousand, one hundred twenty-eight".