4431221331 has 8 divisors (see below), whose sum is σ = 6165177600. Its totient is φ = 2825706312.

The previous prime is 4431221321. The next prime is 4431221359. The reversal of 4431221331 is 1331221344.

It is a happy number.

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

It is not a de Polignac number, because 4431221331 - 2⁵ = 4431221299 is a prime.

It is a super-2 number, since 2×4431221331² = 39271444968618823122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4431221321) 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 7 ways as a sum of consecutive naturals, for example, 32110231 + ... + 32110368.

It is an arithmetic number, because the mean of its divisors is an integer number (770647200).

Almost surely, 2^4431221331 is an apocalyptic number.

4431221331 is a deficient number, since it is larger than the sum of its proper divisors (1733956269).

4431221331 is a wasteful number, since it uses less digits than its factorization.

4431221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64220625.

The product of its digits is 1728, while the sum is 24.

The square root of 4431221331 is about 66567.4194407444. The cubic root of 4431221331 is about 1642.5092130358.

Adding to 4431221331 its reverse (1331221344), we get a palindrome (5762442675).

The spelling of 4431221331 in words is "four billion, four hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-one".