104210521 has 4 divisors (see below), whose sum is σ = 105132852. Its totient is φ = 103288192.

The previous prime is 104210503. The next prime is 104210531. The reversal of 104210521 is 125012401.

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 49154121 + 55056400 = 7011^2 + 7420^2 .

It is a cyclic number.

It is not a de Polignac number, because 104210521 - 2¹⁵ = 104177753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 104210495 and 104210504.

It is not an unprimeable number, because it can be changed into a prime (104210501) 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, 460996 + ... + 461221.

It is an arithmetic number, because the mean of its divisors is an integer number (26283213).

Almost surely, 2^104210521 is an apocalyptic number.

It is an amenable number.

104210521 is a deficient number, since it is larger than the sum of its proper divisors (922331).

104210521 is an equidigital number, since it uses as much as digits as its factorization.

104210521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922330.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 104210521 is about 10208.3554503162. The cubic root of 104210521 is about 470.5840347888.

Adding to 104210521 its reverse (125012401), we get a palindrome (229222922).

It can be divided in two parts, 104210 and 521, that multiplied together give a triangular number (54293410 = T₁₀₄₂₀).

The spelling of 104210521 in words is "one hundred four million, two hundred ten thousand, five hundred twenty-one".