31221331323 has 24 divisors (see below), whose sum is σ = 52149919248. Its totient is φ = 16468393536.

The previous prime is 31221331321. The next prime is 31221331333. The reversal of 31221331323 is 32313312213.

It is not a de Polignac number, because 31221331323 - 2¹ = 31221331321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221331293 and 31221331302.

It is not an unprimeable number, because it can be changed into a prime (31221331321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8166936 + ... + 8170757.

It is an arithmetic number, because the mean of its divisors is an integer number (2172913302).

Almost surely, 2^31221331323 is an apocalyptic number.

31221331323 is a deficient number, since it is larger than the sum of its proper divisors (20928587925).

31221331323 is a wasteful number, since it uses less digits than its factorization.

31221331323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16337723 (or 16337716 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

Adding to 31221331323 its reverse (32313312213), we get a palindrome (63534643536).

The spelling of 31221331323 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-three".