4431221123 has 4 divisors (see below), whose sum is σ = 5064252720. Its totient is φ = 3798189528.

The previous prime is 4431221117. The next prime is 4431221149. The reversal of 4431221123 is 3211221344.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4431221123 - 2¹² = 4431217027 is a prime.

It is a super-2 number, since 2×4431221123² = 39271441281842762258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4431229123) 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, 316515788 + ... + 316515801.

It is an arithmetic number, because the mean of its divisors is an integer number (1266063180).

Almost surely, 2^4431221123 is an apocalyptic number.

4431221123 is a deficient number, since it is larger than the sum of its proper divisors (633031597).

4431221123 is an equidigital number, since it uses as much as digits as its factorization.

4431221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633031596.

The product of its digits is 1152, while the sum is 23.

The square root of 4431221123 is about 66567.4178784186. The cubic root of 4431221123 is about 1642.5091873362.

Adding to 4431221123 its reverse (3211221344), we get a palindrome (7642442467).

It can be divided in two parts, 4431221 and 123, that added together give a palindrome (4431344).

The spelling of 4431221123 in words is "four billion, four hundred thirty-one million, two hundred twenty-one thousand, one hundred twenty-three".