10208521 has 4 divisors (see below), whose sum is σ = 10214932. Its totient is φ = 10202112.

The previous prime is 10208509. The next prime is 10208531. The reversal of 10208521 is 12580201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12580201 = 2351 ⋅5351.

It can be written as a sum of positive squares in 2 ways, for example, as 3474496 + 6734025 = 1864^2 + 2595^2 .

It is a cyclic number.

It is not a de Polignac number, because 10208521 - 2²³ = 1819913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10208531) 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, 1225 + ... + 4681.

It is an arithmetic number, because the mean of its divisors is an integer number (2553733).

Almost surely, 2^10208521 is an apocalyptic number.

It is an amenable number.

10208521 is a deficient number, since it is larger than the sum of its proper divisors (6411).

10208521 is an equidigital number, since it uses as much as digits as its factorization.

10208521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 10208521 is about 3195.0776203404. The cubic root of 10208521 is about 216.9306622956.

Adding to 10208521 its reverse (12580201), we get a palindrome (22788722).

The spelling of 10208521 in words is "ten million, two hundred eight thousand, five hundred twenty-one".