31223032321 has 16 divisors (see below), whose sum is σ = 34901321728. Its totient is φ = 27737380800.

The previous prime is 31223032279. The next prime is 31223032331. The reversal of 31223032321 is 12323032213.

It is a cyclic number.

It is not a de Polignac number, because 31223032321 - 2⁹ = 31223031809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31223032292 and 31223032301.

It is not an unprimeable number, because it can be changed into a prime (31223032331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141081 + ... + 286966.

It is an arithmetic number, because the mean of its divisors is an integer number (2181332608).

Almost surely, 2^31223032321 is an apocalyptic number.

31223032321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31223032321 is a deficient number, since it is larger than the sum of its proper divisors (3678289407).

31223032321 is a wasteful number, since it uses less digits than its factorization.

31223032321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428272.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31223032321 its reverse (12323032213), we get a palindrome (43546064534).

The spelling of 31223032321 in words is "thirty-one billion, two hundred twenty-three million, thirty-two thousand, three hundred twenty-one".