20128113871 has 2 divisors, whose sum is σ = 20128113872. Its totient is φ = 20128113870.

The previous prime is 20128113857. The next prime is 20128113877. The reversal of 20128113871 is 17831182102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20128113871 - 2⁹ = 20128113359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128113877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064056935 + 10064056936.

It is an arithmetic number, because the mean of its divisors is an integer number (10064056936).

Almost surely, 2^20128113871 is an apocalyptic number.

20128113871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128113871 is an equidigital number, since it uses as much as digits as its factorization.

20128113871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 34.

Adding to 20128113871 its reverse (17831182102), we get a palindrome (37959295973).

The spelling of 20128113871 in words is "twenty billion, one hundred twenty-eight million, one hundred thirteen thousand, eight hundred seventy-one".