128149648021 has 8 divisors (see below), whose sum is σ = 134106744384. Its totient is φ = 122224666080.

The previous prime is 128149648009. The next prime is 128149648027. The reversal of 128149648021 is 120846941821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128149648021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128149648027) 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 in 7 ways as a sum of consecutive naturals, for example, 8020440 + ... + 8036401.

It is an arithmetic number, because the mean of its divisors is an integer number (16763343048).

Almost surely, 2^128149648021 is an apocalyptic number.

It is an amenable number.

128149648021 is a deficient number, since it is larger than the sum of its proper divisors (5957096363).

128149648021 is a wasteful number, since it uses less digits than its factorization.

128149648021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16057211.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 128149648021 in words is "one hundred twenty-eight billion, one hundred forty-nine million, six hundred forty-eight thousand, twenty-one".