2101011109 has 4 divisors (see below), whose sum is σ = 2110186060. Its totient is φ = 2091836160.

The previous prime is 2101011103. The next prime is 2101011139. The reversal of 2101011109 is 9011101012.

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 870545025 + 1230466084 = 29505^2 + 35078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101011109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101011092 and 2101011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101011103) 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, 4587132 + ... + 4587589.

It is an arithmetic number, because the mean of its divisors is an integer number (527546515).

Almost surely, 2^2101011109 is an apocalyptic number.

It is an amenable number.

2101011109 is a deficient number, since it is larger than the sum of its proper divisors (9174951).

2101011109 is an equidigital number, since it uses as much as digits as its factorization.

2101011109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9174950.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 2101011109 is about 45836.7877255813. The cubic root of 2101011109 is about 1280.7846566330.

The spelling of 2101011109 in words is "two billion, one hundred one million, eleven thousand, one hundred nine".