121211121204 has 72 divisors (see below), whose sum is σ = 324488324160. Its totient is φ = 38070185472.

The previous prime is 121211121203. The next prime is 121211121223. The reversal of 121211121204 is 402121112121.

121211121204 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211121203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1036989 + ... + 1147940.

It is an arithmetic number, because the mean of its divisors is an integer number (4506782280).

Almost surely, 2^121211121204 is an apocalyptic number.

It is an amenable number.

121211121204 is an abundant number, since it is smaller than the sum of its proper divisors (203277202956).

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

121211121204 is a wasteful number, since it uses less digits than its factorization.

121211121204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185029 (or 2185024 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121211121204 its reverse (402121112121), we get a palindrome (523332233325).

The spelling of 121211121204 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred four".