10428521 has 4 divisors (see below), whose sum is σ = 10438272. Its totient is φ = 10418772.

The previous prime is 10428503. The next prime is 10428527. The reversal of 10428521 is 12582401.

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: 12582401 = 13 ⋅967877.

It is a cyclic number.

It is not a de Polignac number, because 10428521 - 2¹⁰ = 10427497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10428527) 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, 3041 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (2609568).

Almost surely, 2^10428521 is an apocalyptic number.

It is an amenable number.

10428521 is a deficient number, since it is larger than the sum of its proper divisors (9751).

10428521 is an equidigital number, since it uses as much as digits as its factorization.

10428521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9750.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 10428521 is about 3229.3220650781. The cubic root of 10428521 is about 218.4779304895.

The spelling of 10428521 in words is "ten million, four hundred twenty-eight thousand, five hundred twenty-one".