128212193 has 4 divisors (see below), whose sum is σ = 130940160. Its totient is φ = 125484228.

The previous prime is 128212177. The next prime is 128212229. The reversal of 128212193 is 391212821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128212193 - 2⁴ = 128212177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128212153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363913 + ... + 1364006.

It is an arithmetic number, because the mean of its divisors is an integer number (32735040).

Almost surely, 2^128212193 is an apocalyptic number.

It is an amenable number.

128212193 is a deficient number, since it is larger than the sum of its proper divisors (2727967).

128212193 is an equidigital number, since it uses as much as digits as its factorization.

128212193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727966.

The product of its digits is 1728, while the sum is 29.

The square root of 128212193 is about 11323.0823100426. The cubic root of 128212193 is about 504.2467520740.

The spelling of 128212193 in words is "one hundred twenty-eight million, two hundred twelve thousand, one hundred ninety-three".