121428553648 has 10 divisors (see below), whose sum is σ = 235267822724. Its totient is φ = 60714276816.

The previous prime is 121428553643. The next prime is 121428553667. The reversal of 121428553648 is 846355824121.

It is not an unprimeable number, because it can be changed into a prime (121428553643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3794642286 + ... + 3794642317.

Almost surely, 2^121428553648 is an apocalyptic number.

It is an amenable number.

121428553648 is a deficient number, since it is larger than the sum of its proper divisors (113839269076).

121428553648 is an equidigital number, since it uses as much as digits as its factorization.

121428553648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589284611 (or 7589284605 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 49.

The spelling of 121428553648 in words is "one hundred twenty-one billion, four hundred twenty-eight million, five hundred fifty-three thousand, six hundred forty-eight".