121221222222 has 16 divisors (see below), whose sum is σ = 242506341072. Its totient is φ = 40396424640.

The previous prime is 121221222203. The next prime is 121221222223. The reversal of 121221222222 is 222222122121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221222223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2637679 + ... + 2683242.

It is an arithmetic number, because the mean of its divisors is an integer number (15156646317).

Almost surely, 2^121221222222 is an apocalyptic number.

121221222222 is an abundant number, since it is smaller than the sum of its proper divisors (121285118850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221222222 is a wasteful number, since it uses less digits than its factorization.

121221222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324723.

The product of its digits is 512, while the sum is 21.

Adding to 121221222222 its reverse (222222122121), we get a palindrome (343443344343).

The spelling of 121221222222 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".