8231221319 has 4 divisors (see below), whose sum is σ = 8231646096. Its totient is φ = 8230796544.

The previous prime is 8231221309. The next prime is 8231221321. The reversal of 8231221319 is 9131221328.

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

It is a cyclic number.

It is not a de Polignac number, because 8231221319 - 2¹⁶ = 8231155783 is a prime.

It is a super-2 number, since 2×8231221319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8231221309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181859 + ... + 222564.

It is an arithmetic number, because the mean of its divisors is an integer number (2057911524).

Almost surely, 2^8231221319 is an apocalyptic number.

8231221319 is a deficient number, since it is larger than the sum of its proper divisors (424777).

8231221319 is a wasteful number, since it uses less digits than its factorization.

8231221319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424776.

The product of its digits is 5184, while the sum is 32.

The square root of 8231221319 is about 90726.0784945541. The cubic root of 8231221319 is about 2019.0857313244.

Subtracting 8231221319 from its reverse (9131221328), we obtain a palindrome (900000009).

The spelling of 8231221319 in words is "eight billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred nineteen".