13121221103 has 4 divisors (see below), whose sum is σ = 13441250928. Its totient is φ = 12801191280.

The previous prime is 13121221093. The next prime is 13121221117. The reversal of 13121221103 is 30112212131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13121221103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121221123) 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, 160014851 + ... + 160014932.

It is an arithmetic number, because the mean of its divisors is an integer number (3360312732).

Almost surely, 2^13121221103 is an apocalyptic number.

13121221103 is a deficient number, since it is larger than the sum of its proper divisors (320029825).

13121221103 is an equidigital number, since it uses as much as digits as its factorization.

13121221103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320029824.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13121221103 its reverse (30112212131), we get a palindrome (43233433234).

The spelling of 13121221103 in words is "thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred three".