128221364620 has 24 divisors (see below), whose sum is σ = 280972034784. Its totient is φ = 49058608896.

The previous prime is 128221364617. The next prime is 128221364639. The reversal of 128221364620 is 26463122821.

128221364620 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 128221364620.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 139370589 + ... + 139371508.

It is an arithmetic number, because the mean of its divisors is an integer number (11707168116).

Almost surely, 2^128221364620 is an apocalyptic number.

128221364620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128221364620 is an abundant number, since it is smaller than the sum of its proper divisors (152750670164).

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

128221364620 is a wasteful number, since it uses less digits than its factorization.

128221364620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278742129 (or 278742127 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 128221364620 in words is "one hundred twenty-eight billion, two hundred twenty-one million, three hundred sixty-four thousand, six hundred twenty".