12545427121 has 4 divisors (see below), whose sum is σ = 12570368832. Its totient is φ = 12520485412.

The previous prime is 12545427113. The next prime is 12545427137. The reversal of 12545427121 is 12172454521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12172454521 = 137 ⋅88850033.

It is a cyclic number.

It is not a de Polignac number, because 12545427121 - 2³ = 12545427113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12545427101) 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, 12470101 + ... + 12471106.

It is an arithmetic number, because the mean of its divisors is an integer number (3142592208).

Almost surely, 2^12545427121 is an apocalyptic number.

It is an amenable number.

12545427121 is a deficient number, since it is larger than the sum of its proper divisors (24941711).

12545427121 is an equidigital number, since it uses as much as digits as its factorization.

12545427121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24941710.

The product of its digits is 22400, while the sum is 34.

The spelling of 12545427121 in words is "twelve billion, five hundred forty-five million, four hundred twenty-seven thousand, one hundred twenty-one".