20110111101 has 24 divisors (see below), whose sum is σ = 29373522360. Its totient is φ = 13256718336.

The previous prime is 20110111097. The next prime is 20110111139. The reversal of 20110111101 is 10111101102.

It can be written as a sum of positive squares in 4 ways, for example, as 580328100 + 19529783001 = 24090^2 + 139749^2 .

It is not a de Polignac number, because 20110111101 - 2² = 20110111097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110111181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1031835 + ... + 1051143.

It is an arithmetic number, because the mean of its divisors is an integer number (1223896765).

Almost surely, 2^20110111101 is an apocalyptic number.

It is an amenable number.

20110111101 is a deficient number, since it is larger than the sum of its proper divisors (9263411259).

20110111101 is a wasteful number, since it uses less digits than its factorization.

20110111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20605 (or 20602 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 20110111101 its reverse (10111101102), we get a palindrome (30221212203).

Subtracting from 20110111101 its reverse (10111101102), we obtain a palindrome (9999009999).

The spelling of 20110111101 in words is "twenty billion, one hundred ten million, one hundred eleven thousand, one hundred one".