121221110020100 has 72 divisors (see below), whose sum is σ = 267245010099648. Its totient is φ = 47720884528000.

The previous prime is 121221110020099. The next prime is 121221110020159. The reversal of 121221110020100 is 1020011122121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34247702 + ... + 37621101.

It is an arithmetic number, because the mean of its divisors is an integer number (3711736251384).

Almost surely, 2^{121221110020100} is an apocalyptic number.

121221110020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221110020100 is an abundant number, since it is smaller than the sum of its proper divisors (146023900079548).

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

121221110020100 is a wasteful number, since it uses less digits than its factorization.

121221110020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71869085 (or 71869078 counting only the distinct ones).

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

Adding to 121221110020100 its reverse (1020011122121), we get a palindrome (122241121142221).

The spelling of 121221110020100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred ten million, twenty thousand, one hundred".