2101661188973 has 16 divisors (see below), whose sum is σ = 2163618564096. Its totient is φ = 2040849457920.

The previous prime is 2101661188919. The next prime is 2101661188981. The reversal of 2101661188973 is 3798811661012.

It is a cyclic number.

It is not a de Polignac number, because 2101661188973 - 2¹⁰ = 2101661187949 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 (2101661188073) 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, 349265 + ... + 2079737.

It is an arithmetic number, because the mean of its divisors is an integer number (135226160256).

Almost surely, 2^{2101661188973} is an apocalyptic number.

It is an amenable number.

2101661188973 is a deficient number, since it is larger than the sum of its proper divisors (61957375123).

2101661188973 is a wasteful number, since it uses less digits than its factorization.

2101661188973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730804.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 2101661188973 in words is "two trillion, one hundred one billion, six hundred sixty-one million, one hundred eighty-eight thousand, nine hundred seventy-three".