12510521 has 12 divisors (see below), whose sum is σ = 13494492. Its totient is φ = 11593728.

The previous prime is 12510517. The next prime is 12510529. The reversal of 12510521 is 12501521.

It can be written as a sum of positive squares in 6 ways, for example, as 1784896 + 10725625 = 1336^2 + 3275^2 .

It is not a de Polignac number, because 12510521 - 2² = 12510517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12510521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12510529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20801 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (1124541).

Almost surely, 2^12510521 is an apocalyptic number.

It is an amenable number.

12510521 is a deficient number, since it is larger than the sum of its proper divisors (983971).

12510521 is an equidigital number, since it uses as much as digits as its factorization.

12510521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12510521 is about 3537.0214870707. The cubic root of 12510521 is about 232.1445356295.

It can be divided in two parts, 12510 and 521, that added together give a palindrome (13031).

The spelling of 12510521 in words is "twelve million, five hundred ten thousand, five hundred twenty-one".