100385640021 has 4 divisors (see below), whose sum is σ = 133847520032. Its totient is φ = 66923760012.

The previous prime is 100385640001. The next prime is 100385640029. The reversal of 100385640021 is 120046583001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100385640021 - 2²¹ = 100383542869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100385640029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16730940001 + ... + 16730940006.

It is an arithmetic number, because the mean of its divisors is an integer number (33461880008).

Almost surely, 2^100385640021 is an apocalyptic number.

It is an amenable number.

100385640021 is a deficient number, since it is larger than the sum of its proper divisors (33461880011).

100385640021 is an equidigital number, since it uses as much as digits as its factorization.

100385640021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33461880010.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 100385640021 in words is "one hundred billion, three hundred eighty-five million, six hundred forty thousand, twenty-one".