12003502521 has 4 divisors (see below), whose sum is σ = 16004670032. Its totient is φ = 8002335012.

The previous prime is 12003502517. The next prime is 12003502523. The reversal of 12003502521 is 12520530021.

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.

It is not a de Polignac number, because 12003502521 - 2² = 12003502517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12003502523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000583751 + ... + 2000583756.

It is an arithmetic number, because the mean of its divisors is an integer number (4001167508).

Almost surely, 2^12003502521 is an apocalyptic number.

It is an amenable number.

12003502521 is a deficient number, since it is larger than the sum of its proper divisors (4001167511).

12003502521 is an equidigital number, since it uses as much as digits as its factorization.

12003502521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001167510.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 12003502521 in words is "twelve billion, three million, five hundred two thousand, five hundred twenty-one".