11103121003 has 4 divisors (see below), whose sum is σ = 11957207248. Its totient is φ = 10249034760.

The previous prime is 11103120967. The next prime is 11103121009. The reversal of 11103121003 is 30012130111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30012130111 = 3329 ⋅9015359.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11103121003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 854086231 = 11103121003 / (1 + 1 + 1 + 0 + 3 + 1 + 2 + 1 + 0 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11103121009) 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, 427043103 + ... + 427043128.

It is an arithmetic number, because the mean of its divisors is an integer number (2989301812).

Almost surely, 2^11103121003 is an apocalyptic number.

11103121003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11103121003 is a deficient number, since it is larger than the sum of its proper divisors (854086245).

11103121003 is an equidigital number, since it uses as much as digits as its factorization.

11103121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854086244.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 11103121003 its reverse (30012130111), we get a palindrome (41115251114).

The spelling of 11103121003 in words is "eleven billion, one hundred three million, one hundred twenty-one thousand, three".