10216521 has 24 divisors (see below), whose sum is σ = 16957824. Its totient is φ = 5806080.

The previous prime is 10216519. The next prime is 10216537. The reversal of 10216521 is 12561201.

10216521 is a `hidden beast` number, since 10 + 2 + 1 + 652 + 1 = 666.

10216521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10216521 - 2¹ = 10216519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10216494 and 10216503.

It is not an unprimeable number, because it can be changed into a prime (10216561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15876 + ... + 16506.

It is an arithmetic number, because the mean of its divisors is an integer number (706576).

Almost surely, 2^10216521 is an apocalyptic number.

It is an amenable number.

10216521 is a deficient number, since it is larger than the sum of its proper divisors (6741303).

10216521 is a wasteful number, since it uses less digits than its factorization.

10216521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 10216521 is about 3196.3293009326. The cubic root of 10216521 is about 216.9873140594.

Adding to 10216521 its reverse (12561201), we get a palindrome (22777722).

The spelling of 10216521 in words is "ten million, two hundred sixteen thousand, five hundred twenty-one".