21100566072075 has 24 divisors (see below), whose sum is σ = 39870021988608. Its totient is φ = 9645973061280.

The previous prime is 21100566071999. The next prime is 21100566072097. The reversal of 21100566072075 is 57027066500112.

It is a happy number.

It is not a de Polignac number, because 21100566072075 - 2³³ = 21091976137483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20095776687 + ... + 20095777736.

It is an arithmetic number, because the mean of its divisors is an integer number (1661250916192).

Almost surely, 2^{21100566072075} is an apocalyptic number.

21100566072075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21100566072075 is a deficient number, since it is larger than the sum of its proper divisors (18769455916533).

21100566072075 is a wasteful number, since it uses less digits than its factorization.

21100566072075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40191554443 (or 40191554438 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 21100566072075 in words is "twenty-one trillion, one hundred billion, five hundred sixty-six million, seventy-two thousand, seventy-five".