121201728 has 28 divisors (see below), whose sum is σ = 320680080. Its totient is φ = 40400512.

The previous prime is 121201679. The next prime is 121201733. The reversal of 121201728 is 827102121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 121201698 and 121201707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315438 + ... + 315821.

It is an arithmetic number, because the mean of its divisors is an integer number (11452860).

Almost surely, 2^121201728 is an apocalyptic number.

It is an amenable number.

121201728 is an abundant number, since it is smaller than the sum of its proper divisors (199478352).

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

121201728 is an equidigital number, since it uses as much as digits as its factorization.

121201728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631274 (or 631264 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 121201728 is about 11009.1656359599. The cubic root of 121201728 is about 494.8834579223.

Adding to 121201728 its reverse (827102121), we get a palindrome (948303849).

The spelling of 121201728 in words is "one hundred twenty-one million, two hundred one thousand, seven hundred twenty-eight".