20128113911 has 2 divisors, whose sum is σ = 20128113912. Its totient is φ = 20128113910.

The previous prime is 20128113881. The next prime is 20128113953. The reversal of 20128113911 is 11931182102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20128113911 - 2³⁰ = 19054372087 is a prime.

It is a super-2 number, since 2×20128113911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128113991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064056955 + 10064056956.

It is an arithmetic number, because the mean of its divisors is an integer number (10064056956).

Almost surely, 2^20128113911 is an apocalyptic number.

20128113911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128113911 is an equidigital number, since it uses as much as digits as its factorization.

20128113911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 20128113911 in words is "twenty billion, one hundred twenty-eight million, one hundred thirteen thousand, nine hundred eleven".