128847021 has 8 divisors (see below), whose sum is σ = 172059360. Its totient is φ = 85766352.

The previous prime is 128846983. The next prime is 128847031. The reversal of 128847021 is 120748821.

It is a happy number.

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

It is not a de Polignac number, because 128847021 - 2²¹ = 126749869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128847031) 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, 30610 + ... + 34563.

It is an arithmetic number, because the mean of its divisors is an integer number (21507420).

Almost surely, 2^128847021 is an apocalyptic number.

It is an amenable number.

128847021 is a deficient number, since it is larger than the sum of its proper divisors (43212339).

128847021 is an equidigital number, since it uses as much as digits as its factorization.

128847021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65835.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 128847021 is about 11351.0801688650. The cubic root of 128847021 is about 505.0776222871.

The spelling of 128847021 in words is "one hundred twenty-eight million, eight hundred forty-seven thousand, twenty-one".