13121220003 has 4 divisors (see below), whose sum is σ = 17494960008. Its totient is φ = 8747480000.

The previous prime is 13121220001. The next prime is 13121220019. The reversal of 13121220003 is 30002212131.

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

It is a cyclic number.

It is not a de Polignac number, because 13121220003 - 2¹ = 13121220001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121220001) 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, 2186869998 + ... + 2186870003.

It is an arithmetic number, because the mean of its divisors is an integer number (4373740002).

Almost surely, 2^13121220003 is an apocalyptic number.

13121220003 is a deficient number, since it is larger than the sum of its proper divisors (4373740005).

13121220003 is an equidigital number, since it uses as much as digits as its factorization.

13121220003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373740004.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 13121220003 its reverse (30002212131), we get a palindrome (43123432134).

The spelling of 13121220003 in words is "thirteen billion, one hundred twenty-one million, two hundred twenty thousand, three".