4431663321 has 16 divisors (see below), whose sum is σ = 5962564608. Its totient is φ = 2927667600.

The previous prime is 4431663307. The next prime is 4431663329. The reversal of 4431663321 is 1233661344.

It is not a de Polignac number, because 4431663321 - 2⁵ = 4431663289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4431663329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277956 + ... + 293466.

It is an arithmetic number, because the mean of its divisors is an integer number (372660288).

Almost surely, 2^4431663321 is an apocalyptic number.

It is an amenable number.

4431663321 is a deficient number, since it is larger than the sum of its proper divisors (1530901287).

4431663321 is a wasteful number, since it uses less digits than its factorization.

4431663321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16372.

The product of its digits is 31104, while the sum is 33.

The square root of 4431663321 is about 66570.7392252782. The cubic root of 4431663321 is about 1642.5638216457.

The spelling of 4431663321 in words is "four billion, four hundred thirty-one million, six hundred sixty-three thousand, three hundred twenty-one".