4431213321 has 8 divisors (see below), whose sum is σ = 5936286624. Its totient is φ = 2940141120.

The previous prime is 4431213289. The next prime is 4431213331. The reversal of 4431213321 is 1233121344.

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 4431213321 - 2⁵ = 4431213289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4431213291 and 4431213300.

It is not an unprimeable number, because it can be changed into a prime (4431213331) 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, 3499536 + ... + 3500801.

It is an arithmetic number, because the mean of its divisors is an integer number (742035828).

Almost surely, 2^4431213321 is an apocalyptic number.

It is an amenable number.

4431213321 is a deficient number, since it is larger than the sum of its proper divisors (1505073303).

4431213321 is a wasteful number, since it uses less digits than its factorization.

4431213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000551.

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

The square root of 4431213321 is about 66567.3592761497. The cubic root of 4431213321 is about 1642.5082233533.

Adding to 4431213321 its reverse (1233121344), we get a palindrome (5664334665).

The spelling of 4431213321 in words is "four billion, four hundred thirty-one million, two hundred thirteen thousand, three hundred twenty-one".