121220111221804 has 24 divisors (see below), whose sum is σ = 242443615468320. Its totient is φ = 51950749161216.

The previous prime is 121220111221709. The next prime is 121220111221813. The reversal of 121220111221804 is 408122111022121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28256059 + ... + 32262130.

It is an arithmetic number, because the mean of its divisors is an integer number (10101817311180).

Almost surely, 2^{121220111221804} is an apocalyptic number.

121220111221804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121220111221804 is an abundant number, since it is smaller than the sum of its proper divisors (121223504246516).

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

121220111221804 is a wasteful number, since it uses less digits than its factorization.

121220111221804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60589737 (or 60589735 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

Adding to 121220111221804 its reverse (408122111022121), we get a palindrome (529342222243925).

The spelling of 121220111221804 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, eight hundred four".