31223102321 has 4 divisors (see below), whose sum is σ = 31984641444. Its totient is φ = 30461563200.

The previous prime is 31223102311. The next prime is 31223102399. The reversal of 31223102321 is 12320132213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12320132213 = 6299 ⋅1955887.

It can be written as a sum of positive squares in 2 ways, for example, as 7728343921 + 23494758400 = 87911^2 + 153280^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223102321 - 2¹⁸ = 31222840177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31223102293 and 31223102302.

It is not an unprimeable number, because it can be changed into a prime (31223102311) 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, 380769500 + ... + 380769581.

It is an arithmetic number, because the mean of its divisors is an integer number (7996160361).

Almost surely, 2^31223102321 is an apocalyptic number.

It is an amenable number.

31223102321 is a deficient number, since it is larger than the sum of its proper divisors (761539123).

31223102321 is an equidigital number, since it uses as much as digits as its factorization.

31223102321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761539122.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31223102321 its reverse (12320132213), we get a palindrome (43543234534).

The spelling of 31223102321 in words is "thirty-one billion, two hundred twenty-three million, one hundred two thousand, three hundred twenty-one".