128359221 has 8 divisors (see below), whose sum is σ = 171330144. Its totient is φ = 85480560.

The previous prime is 128359219. The next prime is 128359223. The reversal of 128359221 is 122953821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128359219) and next prime (128359223).

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

It is not a de Polignac number, because 128359221 - 2¹ = 128359219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128359223) 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, 19750 + ... + 25431.

It is an arithmetic number, because the mean of its divisors is an integer number (21416268).

Almost surely, 2^128359221 is an apocalyptic number.

It is an amenable number.

128359221 is a deficient number, since it is larger than the sum of its proper divisors (42970923).

128359221 is an equidigital number, since it uses as much as digits as its factorization.

128359221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46131.

The product of its digits is 8640, while the sum is 33.

The square root of 128359221 is about 11329.5728516127. The cubic root of 128359221 is about 504.4394276384.

The spelling of 128359221 in words is "one hundred twenty-eight million, three hundred fifty-nine thousand, two hundred twenty-one".