2129180871 has 4 divisors (see below), whose sum is σ = 2838907832. Its totient is φ = 1419453912.

The previous prime is 2129180813. The next prime is 2129180891. The reversal of 2129180871 is 1780819212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2129180871 - 2⁷ = 2129180743 is a prime.

It is a super-2 number, since 2×2129180871² = 9066822362864637282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129180891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354863476 + ... + 354863481.

It is an arithmetic number, because the mean of its divisors is an integer number (709726958).

Almost surely, 2^2129180871 is an apocalyptic number.

2129180871 is a deficient number, since it is larger than the sum of its proper divisors (709726961).

2129180871 is an equidigital number, since it uses as much as digits as its factorization.

2129180871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709726960.

The product of its (nonzero) digits is 16128, while the sum is 39.

The square root of 2129180871 is about 46143.0479162354. The cubic root of 2129180871 is about 1286.4833956512.

The spelling of 2129180871 in words is "two billion, one hundred twenty-nine million, one hundred eighty thousand, eight hundred seventy-one".