121221210120 has 64 divisors (see below), whose sum is σ = 364182661440. Its totient is φ = 32279520000.

The previous prime is 121221210017. The next prime is 121221210169. The reversal of 121221210120 is 21012122121.

121221210120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121221210120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636406 + ... + 804645.

It is an arithmetic number, because the mean of its divisors is an integer number (5690354085).

Almost surely, 2^121221210120 is an apocalyptic number.

121221210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221210120 is an abundant number, since it is smaller than the sum of its proper divisors (242961451320).

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

121221210120 is a wasteful number, since it uses less digits than its factorization.

121221210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441766 (or 1441762 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221210120 its reverse (21012122121), we get a palindrome (142233332241).

The spelling of 121221210120 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty".