13125514121 has 4 divisors (see below), whose sum is σ = 13696188672. Its totient is φ = 12554839572.

The previous prime is 13125514117. The next prime is 13125514123. The reversal of 13125514121 is 12141552131.

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 not a de Polignac number, because 13125514121 - 2² = 13125514117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13125514123) 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, 285337241 + ... + 285337286.

It is an arithmetic number, because the mean of its divisors is an integer number (3424047168).

Almost surely, 2^13125514121 is an apocalyptic number.

It is an amenable number.

13125514121 is a deficient number, since it is larger than the sum of its proper divisors (570674551).

13125514121 is an equidigital number, since it uses as much as digits as its factorization.

13125514121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570674550.

The product of its digits is 1200, while the sum is 26.

The spelling of 13125514121 in words is "thirteen billion, one hundred twenty-five million, five hundred fourteen thousand, one hundred twenty-one".