13121541155 has 4 divisors (see below), whose sum is σ = 15745849392. Its totient is φ = 10497232920.

The previous prime is 13121541133. The next prime is 13121541157. The reversal of 13121541155 is 55114512131.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-13121541155 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121541157) 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, 1312154111 + ... + 1312154120.

It is an arithmetic number, because the mean of its divisors is an integer number (3936462348).

Almost surely, 2^13121541155 is an apocalyptic number.

13121541155 is a deficient number, since it is larger than the sum of its proper divisors (2624308237).

13121541155 is an equidigital number, since it uses as much as digits as its factorization.

13121541155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624308236.

The product of its digits is 3000, while the sum is 29.

The spelling of 13121541155 in words is "thirteen billion, one hundred twenty-one million, five hundred forty-one thousand, one hundred fifty-five".