105043505521 has 4 divisors (see below), whose sum is σ = 105252340032. Its totient is φ = 104834671012.

The previous prime is 105043505513. The next prime is 105043505527. The reversal of 105043505521 is 125505340501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125505340501 = 31 ⋅4048559371.

It is a cyclic number.

It is not a de Polignac number, because 105043505521 - 2³ = 105043505513 is a prime.

It is a super-2 number, since 2×105043505521² (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 (105043505527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104416501 + ... + 104417506.

It is an arithmetic number, because the mean of its divisors is an integer number (26313085008).

Almost surely, 2^105043505521 is an apocalyptic number.

It is an amenable number.

105043505521 is a deficient number, since it is larger than the sum of its proper divisors (208834511).

105043505521 is an equidigital number, since it uses as much as digits as its factorization.

105043505521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208834510.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 105043505521 in words is "one hundred five billion, forty-three million, five hundred five thousand, five hundred twenty-one".