105404521 has 4 divisors (see below), whose sum is σ = 105458500. Its totient is φ = 105350544.

The previous prime is 105404491. The next prime is 105404543. The reversal of 105404521 is 125404501.

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 72914521 + 32490000 = 8539^2 + 5700^2 .

It is a cyclic number.

It is not a de Polignac number, because 105404521 - 2⁷ = 105404393 is a prime.

It is a super-2 number, since 2×105404521² = 22220226094478882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105404492 and 105404501.

It is not an unprimeable number, because it can be changed into a prime (105404021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23946 + ... + 28003.

It is an arithmetic number, because the mean of its divisors is an integer number (26364625).

Almost surely, 2^105404521 is an apocalyptic number.

It is an amenable number.

105404521 is a deficient number, since it is larger than the sum of its proper divisors (53979).

105404521 is an equidigital number, since it uses as much as digits as its factorization.

105404521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53978.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 105404521 is about 10266.6703950210. The cubic root of 105404521 is about 472.3744649381.

The spelling of 105404521 in words is "one hundred five million, four hundred four thousand, five hundred twenty-one".