121220112204 has 72 divisors (see below), whose sum is σ = 310839433632. Its totient is φ = 39823983360.

The previous prime is 121220112197. The next prime is 121220112239. The reversal of 121220112204 is 402211022121.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 9790962 + ... + 9803334.

It is an arithmetic number, because the mean of its divisors is an integer number (4317214356).

Almost surely, 2^121220112204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220112204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155419716816).

121220112204 is an abundant number, since it is smaller than the sum of its proper divisors (189619321428).

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

121220112204 is a wasteful number, since it uses less digits than its factorization.

121220112204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16287 (or 16282 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121220112204 its reverse (402211022121), we get a palindrome (523431134325).

The spelling of 121220112204 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred four".