31224034321 has 4 divisors (see below), whose sum is σ = 31690064752. Its totient is φ = 30758003892.

The previous prime is 31224034291. The next prime is 31224034363. The reversal of 31224034321 is 12343042213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12343042213 = 2897 ⋅4260629.

It is a cyclic number.

It is not a de Polignac number, because 31224034321 - 2¹³ = 31224026129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31224034381) 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, 233015115 + ... + 233015248.

It is an arithmetic number, because the mean of its divisors is an integer number (7922516188).

Almost surely, 2^31224034321 is an apocalyptic number.

It is an amenable number.

31224034321 is a deficient number, since it is larger than the sum of its proper divisors (466030431).

31224034321 is an equidigital number, since it uses as much as digits as its factorization.

31224034321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466030430.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31224034321 its reverse (12343042213), we get a palindrome (43567076534).

The spelling of 31224034321 in words is "thirty-one billion, two hundred twenty-four million, thirty-four thousand, three hundred twenty-one".