121728898 has 4 divisors (see below), whose sum is σ = 182593350. Its totient is φ = 60864448.

The previous prime is 121728881. The next prime is 121728899. The reversal of 121728898 is 898827121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119749249 + 1979649 = 10943^2 + 1407^2 .

It is not an unprimeable number, because it can be changed into a prime (121728899) 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 as a sum of consecutive naturals, namely, 30432223 + ... + 30432226.

Almost surely, 2^121728898 is an apocalyptic number.

121728898 is a deficient number, since it is larger than the sum of its proper divisors (60864452).

121728898 is an equidigital number, since it uses as much as digits as its factorization.

121728898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60864451.

The product of its digits is 129024, while the sum is 46.

The square root of 121728898 is about 11033.0819810242. The cubic root of 121728898 is about 495.5999228942.

The spelling of 121728898 in words is "one hundred twenty-one million, seven hundred twenty-eight thousand, eight hundred ninety-eight".