121221202200120 has 128 divisors (see below), whose sum is σ = 440804371680000. Its totient is φ = 29386958106240.

The previous prime is 121221202200097. The next prime is 121221202200121. The reversal of 121221202200120 is 21002202122121.

It is a happy number.

121221202200120 is a `hidden beast` number, since 1 + 21 + 221 + 202 + 200 + 1 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121221202200093 and 121221202200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221202200121) 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 31 ways as a sum of consecutive naturals, for example, 5101890570 + ... + 5101914329.

It is an arithmetic number, because the mean of its divisors is an integer number (3443784153750).

Almost surely, 2^{121221202200120} is an apocalyptic number.

121221202200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221202200120 is an abundant number, since it is smaller than the sum of its proper divisors (319583169479880).

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

121221202200120 is a wasteful number, since it uses less digits than its factorization.

121221202200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203804930 (or 10203804920 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221202200120 its reverse (21002202122121), we get a palindrome (142223404322241).

The spelling of 121221202200120 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, two hundred thousand, one hundred twenty".