121121220122 has 16 divisors (see below), whose sum is σ = 207648070080. Its totient is φ = 51906171168.

The previous prime is 121121220109. The next prime is 121121220127. The reversal of 121121220122 is 221022121121.

It is a self number, because there is not a number n which added to its sum of digits gives 121121220122.

It is not an unprimeable number, because it can be changed into a prime (121121220127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 24029 + ... + 492767.

It is an arithmetic number, because the mean of its divisors is an integer number (12978004380).

Almost surely, 2^121121220122 is an apocalyptic number.

121121220122 is a deficient number, since it is larger than the sum of its proper divisors (86526849958).

121121220122 is a wasteful number, since it uses less digits than its factorization.

121121220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487205.

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

Adding to 121121220122 its reverse (221022121121), we get a palindrome (342143341243).

Subtracting 121121220122 from its reverse (221022121121), we obtain a palindrome (99900900999).

The spelling of 121121220122 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".