104400521 has 4 divisors (see below), whose sum is σ = 104421012. Its totient is φ = 104380032.

The previous prime is 104400511. The next prime is 104400533. The reversal of 104400521 is 125004401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125004401 = 19 ⋅6579179.

It can be written as a sum of positive squares in 2 ways, for example, as 10310521 + 94090000 = 3211^2 + 9700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-104400521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 104400521.

It is not an unprimeable number, because it can be changed into a prime (104400511) 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, 4001 + ... + 14993.

It is an arithmetic number, because the mean of its divisors is an integer number (26105253).

Almost surely, 2^104400521 is an apocalyptic number.

It is an amenable number.

104400521 is a deficient number, since it is larger than the sum of its proper divisors (20491).

104400521 is an equidigital number, since it uses as much as digits as its factorization.

104400521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20490.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 104400521 is about 10217.6573146686. The cubic root of 104400521 is about 470.8698558420.

Adding to 104400521 its reverse (125004401), we get a palindrome (229404922).

The spelling of 104400521 in words is "one hundred four million, four hundred thousand, five hundred twenty-one".