128249200185121 has 8 divisors (see below), whose sum is σ = 128349356181984. Its totient is φ = 128149045452480.

The previous prime is 128249200185059. The next prime is 128249200185133. The reversal of 128249200185121 is 121581002942821.

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 128249200185121 - 2³⁵ = 128214840446753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128249200185721) 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, 391619970 + ... + 391947316.

It is an arithmetic number, because the mean of its divisors is an integer number (16043669522748).

Almost surely, 2^{128249200185121} is an apocalyptic number.

It is an amenable number.

128249200185121 is a deficient number, since it is larger than the sum of its proper divisors (100155996863).

128249200185121 is a wasteful number, since it uses less digits than its factorization.

128249200185121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632111.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 128249200185121 in words is "one hundred twenty-eight trillion, two hundred forty-nine billion, two hundred million, one hundred eighty-five thousand, one hundred twenty-one".