105643065321 has 8 divisors (see below), whose sum is σ = 156508244960. Its totient is φ = 70428710196.

The previous prime is 105643065301. The next prime is 105643065329. The reversal of 105643065321 is 123560346501.

105643065321 is a `hidden beast` number, since 1 + 0 + 5 + 643 + 0 + 6 + 5 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 105643065321 - 2⁹ = 105643064809 is a prime.

It is a super-2 number, since 2×105643065321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105643065329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1956353035 + ... + 1956353088.

It is an arithmetic number, because the mean of its divisors is an integer number (19563530620).

Almost surely, 2^105643065321 is an apocalyptic number.

It is an amenable number.

105643065321 is a deficient number, since it is larger than the sum of its proper divisors (50865179639).

105643065321 is an equidigital number, since it uses as much as digits as its factorization.

105643065321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912706132 (or 3912706126 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 105643065321 in words is "one hundred five billion, six hundred forty-three million, sixty-five thousand, three hundred twenty-one".