12542071121 has 4 divisors (see below), whose sum is σ = 12542313072. Its totient is φ = 12541829172.

The previous prime is 12542071099. The next prime is 12542071141. The reversal of 12542071121 is 12117024521.

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 a de Polignac number, because none of the positive numbers 2^k-12542071121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12542071141) 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, 8135 + ... + 158588.

It is an arithmetic number, because the mean of its divisors is an integer number (3135578268).

Almost surely, 2^12542071121 is an apocalyptic number.

It is an amenable number.

12542071121 is a deficient number, since it is larger than the sum of its proper divisors (241951).

12542071121 is an equidigital number, since it uses as much as digits as its factorization.

12542071121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241950.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 12542071121 its reverse (12117024521), we get a palindrome (24659095642).

The spelling of 12542071121 in words is "twelve billion, five hundred forty-two million, seventy-one thousand, one hundred twenty-one".