4128321 has 8 divisors (see below), whose sum is σ = 5521600. Its totient is φ = 2743632.

The previous prime is 4128307. The next prime is 4128323. The reversal of 4128321 is 1238214.

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

It is not a de Polignac number, because 4128321 - 2⁷ = 4128193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4128323) 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, 925 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (690200).

Almost surely, 2^4128321 is an apocalyptic number.

It is an amenable number.

4128321 is a deficient number, since it is larger than the sum of its proper divisors (1393279).

4128321 is a wasteful number, since it uses less digits than its factorization.

4128321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295.

The product of its digits is 384, while the sum is 21.

The square root of 4128321 is about 2031.8270103530. The cubic root of 4128321 is about 160.4197442336.

The spelling of 4128321 in words is "four million, one hundred twenty-eight thousand, three hundred twenty-one".