4128530421 has 8 divisors (see below), whose sum is σ = 5514349984. Its totient is φ = 2747532240.

The previous prime is 4128530407. The next prime is 4128530477. The reversal of 4128530421 is 1240358214.

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

It is not a de Polignac number, because 4128530421 - 2⁵ = 4128530389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4128530321) 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, 1203346 + ... + 1206771.

It is an arithmetic number, because the mean of its divisors is an integer number (689293748).

Almost surely, 2^4128530421 is an apocalyptic number.

It is an amenable number.

4128530421 is a deficient number, since it is larger than the sum of its proper divisors (1385819563).

4128530421 is a wasteful number, since it uses less digits than its factorization.

4128530421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410691.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 4128530421 is about 64253.6413053766. The cubic root of 4128530421 is about 1604.2245677261.

Adding to 4128530421 its reverse (1240358214), we get a palindrome (5368888635).

The spelling of 4128530421 in words is "four billion, one hundred twenty-eight million, five hundred thirty thousand, four hundred twenty-one".