128196321 has 16 divisors (see below), whose sum is σ = 189630720. Its totient is φ = 76376720.

The previous prime is 128196311. The next prime is 128196331. The reversal of 128196321 is 123691821.

It is an interprime number because it is at equal distance from previous prime (128196311) and next prime (128196331).

It is a cyclic number.

It is not a de Polignac number, because 128196321 - 2¹⁴ = 128179937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (128196311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30975 + ... + 34868.

It is an arithmetic number, because the mean of its divisors is an integer number (11851920).

Almost surely, 2^128196321 is an apocalyptic number.

128196321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128196321 is a deficient number, since it is larger than the sum of its proper divisors (61434399).

128196321 is a wasteful number, since it uses less digits than its factorization.

128196321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65916.

The product of its digits is 5184, while the sum is 33.

The square root of 128196321 is about 11322.3814191185. The cubic root of 128196321 is about 504.2259435103.

The spelling of 128196321 in words is "one hundred twenty-eight million, one hundred ninety-six thousand, three hundred twenty-one".