20100111201 has 16 divisors (see below), whose sum is σ = 30145574720. Its totient is φ = 13400072676.

The previous prime is 20100111151. The next prime is 20100111203. The reversal of 20100111201 is 10211100102.

It is a happy number.

It is not a de Polignac number, because 20100111201 - 2¹⁵ = 20100078433 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 not an unprimeable number, because it can be changed into a prime (20100111203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4593175 + ... + 4597548.

It is an arithmetic number, because the mean of its divisors is an integer number (1884098420).

Almost surely, 2^20100111201 is an apocalyptic number.

It is an amenable number.

20100111201 is a deficient number, since it is larger than the sum of its proper divisors (10045463519).

20100111201 is an frugal number, since it uses more digits than its factorization.

20100111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190744 (or 9190726 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20100111201 its reverse (10211100102), we get a palindrome (30311211303).

The spelling of 20100111201 in words is "twenty billion, one hundred million, one hundred eleven thousand, two hundred one".