12511476121 has 4 divisors (see below), whose sum is σ = 12513781044. Its totient is φ = 12509171200.

The previous prime is 12511476113. The next prime is 12511476139. The reversal of 12511476121 is 12167411521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11435308096 + 1076168025 = 106936^2 + 32805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511476121 - 2³ = 12511476113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12511476151) 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, 1144300 + ... + 1155181.

It is an arithmetic number, because the mean of its divisors is an integer number (3128445261).

Almost surely, 2^12511476121 is an apocalyptic number.

It is an amenable number.

12511476121 is a deficient number, since it is larger than the sum of its proper divisors (2304923).

12511476121 is an equidigital number, since it uses as much as digits as its factorization.

12511476121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304922.

The product of its digits is 3360, while the sum is 31.

Adding to 12511476121 its reverse (12167411521), we get a palindrome (24678887642).

The spelling of 12511476121 in words is "twelve billion, five hundred eleven million, four hundred seventy-six thousand, one hundred twenty-one".