4005123321 has 4 divisors (see below), whose sum is σ = 5340164432. Its totient is φ = 2670082212.

The previous prime is 4005123281. The next prime is 4005123323. The reversal of 4005123321 is 1233215004.

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 not a de Polignac number, because 4005123321 - 2⁹ = 4005122809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4005123323) 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, 667520551 + ... + 667520556.

It is an arithmetic number, because the mean of its divisors is an integer number (1335041108).

Almost surely, 2^4005123321 is an apocalyptic number.

It is an amenable number.

4005123321 is a deficient number, since it is larger than the sum of its proper divisors (1335041111).

4005123321 is a wasteful number, since it uses less digits than its factorization.

4005123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335041110.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 4005123321 is about 63286.0436510294. The cubic root of 4005123321 is about 1588.0784932501.

Adding to 4005123321 its reverse (1233215004), we get a palindrome (5238338325).

The spelling of 4005123321 in words is "four billion, five million, one hundred twenty-three thousand, three hundred twenty-one".