10209521 has 8 divisors (see below), whose sum is σ = 11983680. Its totient is φ = 8514288.

The previous prime is 10209497. The next prime is 10209559. The reversal of 10209521 is 12590201.

10209521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10209521 - 2¹⁴ = 10193137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10209493 and 10209502.

It is not an unprimeable number, because it can be changed into a prime (10209721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19451 + ... + 19968.

It is an arithmetic number, because the mean of its divisors is an integer number (1497960).

Almost surely, 2^10209521 is an apocalyptic number.

It is an amenable number.

10209521 is a deficient number, since it is larger than the sum of its proper divisors (1774159).

10209521 is an equidigital number, since it uses as much as digits as its factorization.

10209521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39463.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 10209521 is about 3195.2341072291. The cubic root of 10209521 is about 216.9377453843.

Adding to 10209521 its reverse (12590201), we get a palindrome (22799722).

The spelling of 10209521 in words is "ten million, two hundred nine thousand, five hundred twenty-one".