20101911011 has 12 divisors (see below), whose sum is σ = 24876753552. Its totient is φ = 15904807776.

The previous prime is 20101911007. The next prime is 20101911043. The reversal of 20101911011 is 11011910102.

It is a happy number.

It is not a de Polignac number, because 20101911011 - 2² = 20101911007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101913011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8494976 + ... + 8497341.

It is an arithmetic number, because the mean of its divisors is an integer number (2073062796).

Almost surely, 2^20101911011 is an apocalyptic number.

20101911011 is a deficient number, since it is larger than the sum of its proper divisors (4774842541).

20101911011 is a wasteful number, since it uses less digits than its factorization.

20101911011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16992350 (or 16992337 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 17.

Subtracting from 20101911011 its reverse (11011910102), we obtain a palindrome (9090000909).

It can be divided in two parts, 201019 and 11011, that multiplied together give a square (2213420209 = 47047²).

The spelling of 20101911011 in words is "twenty billion, one hundred one million, nine hundred eleven thousand, eleven".