104521 has 4 divisors (see below), whose sum is σ = 105472. Its totient is φ = 103572.

The previous prime is 104513. The next prime is 104527. The reversal of 104521 is 125401.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125401 = 89 ⋅1409.

It is a cyclic number.

It is not a de Polignac number, because 104521 - 2³ = 104513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285 + ... + 538.

It is an arithmetic number, because the mean of its divisors is an integer number (26368).

2¹⁰⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

104521 is a deficient number, since it is larger than the sum of its proper divisors (951).

104521 is an equidigital number, since it uses as much as digits as its factorization.

104521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 104521 is about 323.2970770050. The cubic root of 104521 is about 47.1050915351.

Adding to 104521 its reverse (125401), we get a palindrome (229922).

It can be divided in two parts, 1045 and 21, that multiplied together give a triangular number (21945 = T₂₀₉).

The spelling of 104521 in words is "one hundred four thousand, five hundred twenty-one".