105306521 has 4 divisors (see below), whose sum is σ = 105716532. Its totient is φ = 104896512.

The previous prime is 105306503. The next prime is 105306529. The reversal of 105306521 is 125603501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83814025 + 21492496 = 9155^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 105306521 - 2²² = 101112217 is a prime.

It is a super-2 number, since 2×105306521² = 22178926730246882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105306529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204620 + ... + 205133.

It is an arithmetic number, because the mean of its divisors is an integer number (26429133).

Almost surely, 2^105306521 is an apocalyptic number.

It is an amenable number.

105306521 is a deficient number, since it is larger than the sum of its proper divisors (410011).

105306521 is an equidigital number, since it uses as much as digits as its factorization.

105306521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410010.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 105306521 is about 10261.8965596034. The cubic root of 105306521 is about 472.2280226052.

The spelling of 105306521 in words is "one hundred five million, three hundred six thousand, five hundred twenty-one".