128001991214 has 32 divisors (see below), whose sum is σ = 209150272800. Its totient is φ = 58521415680.

The previous prime is 128001991207. The next prime is 128001991261. The reversal of 128001991214 is 412199100821.

128001991214 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3420734 + ... + 3457950.

It is an arithmetic number, because the mean of its divisors is an integer number (6535946025).

Almost surely, 2^128001991214 is an apocalyptic number.

128001991214 is a deficient number, since it is larger than the sum of its proper divisors (81148281586).

128001991214 is a wasteful number, since it uses less digits than its factorization.

128001991214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40388.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 128001991214 in words is "one hundred twenty-eight billion, one million, nine hundred ninety-one thousand, two hundred fourteen".