1224431321 has 4 divisors (see below), whose sum is σ = 1252906512. Its totient is φ = 1195956132.

The previous prime is 1224431317. The next prime is 1224431323. The reversal of 1224431321 is 1231344221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1224431321 - 2² = 1224431317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224431323) 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, 14237531 + ... + 14237616.

It is an arithmetic number, because the mean of its divisors is an integer number (313226628).

Almost surely, 2^1224431321 is an apocalyptic number.

It is an amenable number.

1224431321 is a deficient number, since it is larger than the sum of its proper divisors (28475191).

1224431321 is an equidigital number, since it uses as much as digits as its factorization.

1224431321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28475190.

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

The square root of 1224431321 is about 34991.8750712219. The cubic root of 1224431321 is about 1069.8218823086.

Adding to 1224431321 its reverse (1231344221), we get a palindrome (2455775542).

The spelling of 1224431321 in words is "one billion, two hundred twenty-four million, four hundred thirty-one thousand, three hundred twenty-one".