31212323321 has 4 divisors (see below), whose sum is σ = 32855077200. Its totient is φ = 29569569444.

The previous prime is 31212323287. The next prime is 31212323369. The reversal of 31212323321 is 12332321213.

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 a de Polignac number, because none of the positive numbers 2^k-31212323321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212323381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821376911 + ... + 821376948.

It is an arithmetic number, because the mean of its divisors is an integer number (8213769300).

Almost surely, 2^31212323321 is an apocalyptic number.

It is an amenable number.

31212323321 is a deficient number, since it is larger than the sum of its proper divisors (1642753879).

31212323321 is a wasteful number, since it uses less digits than its factorization.

31212323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642753878.

The product of its digits is 1296, while the sum is 23.

Adding to 31212323321 its reverse (12332321213), we get a palindrome (43544644534).

The spelling of 31212323321 in words is "thirty-one billion, two hundred twelve million, three hundred twenty-three thousand, three hundred twenty-one".