12125052540121 has 4 divisors (see below), whose sum is σ = 12838290924852. Its totient is φ = 11411814155392.

The previous prime is 12125052540109. The next prime is 12125052540151. The reversal of 12125052540121 is 12104525052121.

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 5896713739225 + 6228338800896 = 2428315^2 + 2495664^2 .

It is a cyclic number.

It is not a de Polignac number, because 12125052540121 - 2¹⁹ = 12125052015833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12125052540151) 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, 356619192340 + ... + 356619192373.

It is an arithmetic number, because the mean of its divisors is an integer number (3209572731213).

Almost surely, 2^{12125052540121} is an apocalyptic number.

It is an amenable number.

12125052540121 is a deficient number, since it is larger than the sum of its proper divisors (713238384731).

12125052540121 is an equidigital number, since it uses as much as digits as its factorization.

12125052540121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713238384730.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 12125052540121 its reverse (12104525052121), we get a palindrome (24229577592242).

The spelling of 12125052540121 in words is "twelve trillion, one hundred twenty-five billion, fifty-two million, five hundred forty thousand, one hundred twenty-one".