2129128175 has 24 divisors (see below), whose sum is σ = 2673537216. Its totient is φ = 1681827840.

The previous prime is 2129128139. The next prime is 2129128181. The reversal of 2129128175 is 5718219212.

It is not a de Polignac number, because 2129128175 - 2¹⁸ = 2128866031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1495514 + ... + 1496936.

It is an arithmetic number, because the mean of its divisors is an integer number (111397384).

Almost surely, 2^2129128175 is an apocalyptic number.

2129128175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2129128175 is a deficient number, since it is larger than the sum of its proper divisors (544409041).

2129128175 is a wasteful number, since it uses less digits than its factorization.

2129128175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147 (or 2142 counting only the distinct ones).

The product of its digits is 20160, while the sum is 38.

The square root of 2129128175 is about 46142.4769057752. The cubic root of 2129128175 is about 1286.4727823226.

The spelling of 2129128175 in words is "two billion, one hundred twenty-nine million, one hundred twenty-eight thousand, one hundred seventy-five".