12511541421 has 8 divisors (see below), whose sum is σ = 18535616960. Its totient is φ = 8341027596.

The previous prime is 12511541389. The next prime is 12511541431. The reversal of 12511541421 is 12414511521.

12511541421 is a `hidden beast` number, since 1 + 2 + 511 + 5 + 4 + 142 + 1 = 666.

It is not a de Polignac number, because 12511541421 - 2⁵ = 12511541389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 463390423 = 12511541421 / (1 + 2 + 5 + 1 + 1 + 5 + 4 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511541431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231695185 + ... + 231695238.

It is an arithmetic number, because the mean of its divisors is an integer number (2316952120).

Almost surely, 2^12511541421 is an apocalyptic number.

It is an amenable number.

12511541421 is a deficient number, since it is larger than the sum of its proper divisors (6024075539).

12511541421 is an equidigital number, since it uses as much as digits as its factorization.

12511541421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463390432 (or 463390426 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The spelling of 12511541421 in words is "twelve billion, five hundred eleven million, five hundred forty-one thousand, four hundred twenty-one".