2100120122101 has 4 divisors (see below), whose sum is σ = 2100140253100. Its totient is φ = 2100099991104.

The previous prime is 2100120122099. The next prime is 2100120122117. The reversal of 2100120122101 is 1012210210012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 740634081201 + 1359486040900 = 860601^2 + 1165970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100120122101 - 2¹ = 2100120122099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120122161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9908196 + ... + 10117933.

It is an arithmetic number, because the mean of its divisors is an integer number (525035063275).

Almost surely, 2^{2100120122101} is an apocalyptic number.

It is an amenable number.

2100120122101 is a deficient number, since it is larger than the sum of its proper divisors (20130999).

2100120122101 is a wasteful number, since it uses less digits than its factorization.

2100120122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130998.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100120122101 its reverse (1012210210012), we get a palindrome (3112330332113).

The spelling of 2100120122101 in words is "two trillion, one hundred billion, one hundred twenty million, one hundred twenty-two thousand, one hundred one".