2128801723 has 2 divisors, whose sum is σ = 2128801724. Its totient is φ = 2128801722.

The previous prime is 2128801721. The next prime is 2128801739. The reversal of 2128801723 is 3271088212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2128801723 - 2¹ = 2128801721 is a prime.

Together with 2128801721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2128801721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064400861 + 1064400862.

It is an arithmetic number, because the mean of its divisors is an integer number (1064400862).

Almost surely, 2^2128801723 is an apocalyptic number.

2128801723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128801723 is an equidigital number, since it uses as much as digits as its factorization.

2128801723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 2128801723 is about 46138.9393354464. The cubic root of 2128801723 is about 1286.4070287928.

Adding to 2128801723 its reverse (3271088212), we get a palindrome (5399889935).

The spelling of 2128801723 in words is "two billion, one hundred twenty-eight million, eight hundred one thousand, seven hundred twenty-three".