12111221110 has 32 divisors (see below), whose sum is σ = 23088418560. Its totient is φ = 4561347168.

The previous prime is 12111221099. The next prime is 12111221131. The reversal of 12111221110 is 1112211121.

It is a happy number.

12111221110 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164562 + ... + 226501.

It is an arithmetic number, because the mean of its divisors is an integer number (721513080).

Almost surely, 2^12111221110 is an apocalyptic number.

12111221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12111221110 is a deficient number, since it is larger than the sum of its proper divisors (10977197450).

12111221110 is a wasteful number, since it uses less digits than its factorization.

12111221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391252.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12111221110 its reverse (1112211121), we get a palindrome (13223432231).

The spelling of 12111221110 in words is "twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred ten".