2100120001109 has 4 divisors (see below), whose sum is σ = 2261667693516. Its totient is φ = 1938572308704.

The previous prime is 2100120001051. The next prime is 2100120001127. The reversal of 2100120001109 is 9011000210012.

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 562822546225 + 1537297454884 = 750215^2 + 1239878^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100120001109 - 2²⁸ = 2099851565653 is a prime.

It is a super-2 number, since 2×2100120001109² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120001129) 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, 80773846184 + ... + 80773846209.

It is an arithmetic number, because the mean of its divisors is an integer number (565416923379).

Almost surely, 2^{2100120001109} is an apocalyptic number.

It is an amenable number.

2100120001109 is a deficient number, since it is larger than the sum of its proper divisors (161547692407).

2100120001109 is a wasteful number, since it uses less digits than its factorization.

2100120001109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161547692406.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 2100120001109 in words is "two trillion, one hundred billion, one hundred twenty million, one thousand, one hundred nine".