12111221103 has 4 divisors (see below), whose sum is σ = 16148294808. Its totient is φ = 8074147400.

The previous prime is 12111221099. The next prime is 12111221131. The reversal of 12111221103 is 30112211121.

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 12111221103 - 2² = 12111221099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221153) 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, 2018536848 + ... + 2018536853.

It is an arithmetic number, because the mean of its divisors is an integer number (4037073702).

Almost surely, 2^12111221103 is an apocalyptic number.

12111221103 is a deficient number, since it is larger than the sum of its proper divisors (4037073705).

12111221103 is an equidigital number, since it uses as much as digits as its factorization.

12111221103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037073704.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12111221103 its reverse (30112211121), we get a palindrome (42223432224).

The spelling of 12111221103 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred three".