128979221841 has 12 divisors (see below), whose sum is σ = 190635956368. Its totient is φ = 83986469784.

The previous prime is 128979221831. The next prime is 128979221857. The reversal of 128979221841 is 148122979821.

It is not a de Polignac number, because 128979221841 - 2¹⁴ = 128979205457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128979221801) 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 11 ways as a sum of consecutive naturals, for example, 166639435 + ... + 166640208.

Almost surely, 2^128979221841 is an apocalyptic number.

It is an amenable number.

128979221841 is a deficient number, since it is larger than the sum of its proper divisors (61656734527).

128979221841 is a wasteful number, since it uses less digits than its factorization.

128979221841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333279692 (or 333279689 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 128979221841 in words is "one hundred twenty-eight billion, nine hundred seventy-nine million, two hundred twenty-one thousand, eight hundred forty-one".