12001221111020 has 24 divisors (see below), whose sum is σ = 25203521133168. Its totient is φ = 4800306196800.

The previous prime is 12001221110999. The next prime is 12001221111031. The reversal of 12001221111020 is 2011112210021.

It is a junction number, because it is equal to n+sod(n) for n = 12001221110986 and 12001221111004.

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, 10849871 + ... + 11904710.

It is an arithmetic number, because the mean of its divisors is an integer number (1050146713882).

Almost surely, 2^{12001221111020} is an apocalyptic number.

12001221111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12001221111020 is an abundant number, since it is smaller than the sum of its proper divisors (13202300022148).

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

12001221111020 is a wasteful number, since it uses less digits than its factorization.

12001221111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22780961 (or 22780959 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12001221111020 its reverse (2011112210021), we get a palindrome (14012333321041).

The spelling of 12001221111020 in words is "twelve trillion, one billion, two hundred twenty-one million, one hundred eleven thousand, twenty".