121221200210000 has 100 divisors (see below), whose sum is σ = 320169434285184. Its totient is φ = 44080436400000.

The previous prime is 121221200209999. The next prime is 121221200210009. The reversal of 121221200210000 is 12002122121.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221200210009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 550895456 + ... + 551115455.

Almost surely, 2^{121221200210000} is an apocalyptic number.

121221200210000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221200210000 is an abundant number, since it is smaller than the sum of its proper divisors (198948234075184).

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

121221200210000 is a wasteful number, since it uses less digits than its factorization.

121221200210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102010950 (or 1102010929 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221200210000 its reverse (12002122121), we get a palindrome (121233202332121).

The spelling of 121221200210000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred million, two hundred ten thousand".