12121221122 has 16 divisors (see below), whose sum is σ = 19121743872. Its totient is φ = 5751456480.

The previous prime is 12121221121. The next prime is 12121221137. The reversal of 12121221122 is 22112212121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 12121221122.

It is not an unprimeable number, because it can be changed into a prime (12121221121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031579 + ... + 1043262.

It is an arithmetic number, because the mean of its divisors is an integer number (1195108992).

Almost surely, 2^12121221122 is an apocalyptic number.

12121221122 is a deficient number, since it is larger than the sum of its proper divisors (7000522750).

12121221122 is a wasteful number, since it uses less digits than its factorization.

12121221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074993.

The product of its digits is 64, while the sum is 17.

Adding to 12121221122 its reverse (22112212121), we get a palindrome (34233433243).

Subtracting 12121221122 from its reverse (22112212121), we obtain a palindrome (9990990999).

The spelling of 12121221122 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".