20100111100101 has 8 divisors (see below), whose sum is σ = 29777942370560. Its totient is φ = 13400074066716.

The previous prime is 20100111100093. The next prime is 20100111100103. The reversal of 20100111100101 is 10100111100102.

It is not a de Polignac number, because 20100111100101 - 2³ = 20100111100093 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100111100103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372224279605 + ... + 372224279658.

It is an arithmetic number, because the mean of its divisors is an integer number (3722242796320).

Almost surely, 2^{20100111100101} is an apocalyptic number.

It is an amenable number.

20100111100101 is a deficient number, since it is larger than the sum of its proper divisors (9677831270459).

20100111100101 is an equidigital number, since it uses as much as digits as its factorization.

20100111100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744448559272 (or 744448559266 counting only the distinct ones).

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

Adding to 20100111100101 its reverse (10100111100102), we get a palindrome (30200222200203).

Subtracting from 20100111100101 its reverse (10100111100102), we obtain a palindrome (9999999999999).

The spelling of 20100111100101 in words is "twenty trillion, one hundred billion, one hundred eleven million, one hundred thousand, one hundred one".