12511042521 has 4 divisors (see below), whose sum is σ = 16681390032. Its totient is φ = 8340695012.

The previous prime is 12511042501. The next prime is 12511042549. The reversal of 12511042521 is 12524011521.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 12511042521 - 2⁹ = 12511042009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12511042491 and 12511042500.

It is not an unprimeable number, because it can be changed into a prime (12511042501) 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, 2085173751 + ... + 2085173756.

It is an arithmetic number, because the mean of its divisors is an integer number (4170347508).

Almost surely, 2^12511042521 is an apocalyptic number.

It is an amenable number.

12511042521 is a deficient number, since it is larger than the sum of its proper divisors (4170347511).

12511042521 is an equidigital number, since it uses as much as digits as its factorization.

12511042521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170347510.

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 12511042521 in words is "twelve billion, five hundred eleven million, forty-two thousand, five hundred twenty-one".