121221200001100 has 72 divisors (see below), whose sum is σ = 263176513402880. Its totient is φ = 48465164704320.

The previous prime is 121221200001089. The next prime is 121221200001127. The reversal of 121221200001100 is 1100002122121.

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, 2893984357 + ... + 2894026243.

Almost surely, 2^{121221200001100} is an apocalyptic number.

121221200001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221200001100 is an abundant number, since it is smaller than the sum of its proper divisors (141955313401780).

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

121221200001100 is a wasteful number, since it uses less digits than its factorization.

121221200001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55127 (or 55120 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221200001100 its reverse (1100002122121), we get a palindrome (122321202123221).

The spelling of 121221200001100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred million, one thousand, one hundred".