121200120321 has 16 divisors (see below), whose sum is σ = 184692604800. Its totient is φ = 69254696448.

The previous prime is 121200120311. The next prime is 121200120323. The reversal of 121200120321 is 123021002121.

It is not a de Polignac number, because 121200120321 - 2⁷ = 121200120193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121200120321.

It is not an unprimeable number, because it can be changed into a prime (121200120323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596295 + ... + 773283.

It is an arithmetic number, because the mean of its divisors is an integer number (11543287800).

Almost surely, 2^121200120321 is an apocalyptic number.

It is an amenable number.

121200120321 is a deficient number, since it is larger than the sum of its proper divisors (63492484479).

121200120321 is a wasteful number, since it uses less digits than its factorization.

121200120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209608.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121200120321 its reverse (123021002121), we get a palindrome (244221122442).

The spelling of 121200120321 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty thousand, three hundred twenty-one".