12511142521 has 4 divisors (see below), whose sum is σ = 12523949172. Its totient is φ = 12498335872.

The previous prime is 12511142513. The next prime is 12511142543. The reversal of 12511142521 is 12524111521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12524111521 = 1489 ⋅8411089.

It can be written as a sum of positive squares in 2 ways, for example, as 9300673600 + 3210468921 = 96440^2 + 56661^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511142521 - 2³ = 12511142513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12511142551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6401860 + ... + 6403813.

It is an arithmetic number, because the mean of its divisors is an integer number (3130987293).

Almost surely, 2^12511142521 is an apocalyptic number.

It is an amenable number.

12511142521 is a deficient number, since it is larger than the sum of its proper divisors (12806651).

12511142521 is an equidigital number, since it uses as much as digits as its factorization.

12511142521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12806650.

The product of its digits is 800, while the sum is 25.

The spelling of 12511142521 in words is "twelve billion, five hundred eleven million, one hundred forty-two thousand, five hundred twenty-one".