2111902105109 has 4 divisors (see below), whose sum is σ = 2184726315660. Its totient is φ = 2039077894560.

The previous prime is 2111902105097. The next prime is 2111902105141. The reversal of 2111902105109 is 9015012091112.

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 861313924900 + 1250588180209 = 928070^2 + 1118297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111902105109 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 (2111902105169) 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, 36412105232 + ... + 36412105289.

It is an arithmetic number, because the mean of its divisors is an integer number (546181578915).

Almost surely, 2^{2111902105109} is an apocalyptic number.

2111902105109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2111902105109 is a deficient number, since it is larger than the sum of its proper divisors (72824210551).

2111902105109 is an equidigital number, since it uses as much as digits as its factorization.

2111902105109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72824210550.

The product of its (nonzero) digits is 1620, while the sum is 32.

The spelling of 2111902105109 in words is "two trillion, one hundred eleven billion, nine hundred two million, one hundred five thousand, one hundred nine".