128934813930721 has 8 divisors (see below), whose sum is σ = 137038534992320. Its totient is φ = 120962860691472.

The previous prime is 128934813930679. The next prime is 128934813930731. The reversal of 128934813930721 is 127039318439821.

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

It is a cyclic number.

It is not a de Polignac number, because 128934813930721 - 2¹¹ = 128934813928673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128934813930721.

It is not an unprimeable number, because it can be changed into a prime (128934813930731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32941953570 + ... + 32941957483.

It is an arithmetic number, because the mean of its divisors is an integer number (17129816874040).

Almost surely, 2^{128934813930721} is an apocalyptic number.

It is an amenable number.

128934813930721 is a deficient number, since it is larger than the sum of its proper divisors (8103721061599).

128934813930721 is a wasteful number, since it uses less digits than its factorization.

128934813930721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65883911175.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 128934813930721 in words is "one hundred twenty-eight trillion, nine hundred thirty-four billion, eight hundred thirteen million, nine hundred thirty thousand, seven hundred twenty-one".