31223121332 has 96 divisors (see below), whose sum is σ = 63316663200. Its totient is φ = 13344325632.

The previous prime is 31223121313. The next prime is 31223121337. The reversal of 31223121332 is 23312132213.

It can be written as a sum of positive squares in 16 ways, for example, as 4167477136 + 27055644196 = 64556^2 + 164486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31223121298 and 31223121307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223121337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18015938 + ... + 18017670.

It is an arithmetic number, because the mean of its divisors is an integer number (659548575).

Almost surely, 2^31223121332 is an apocalyptic number.

It is an amenable number.

31223121332 is an abundant number, since it is smaller than the sum of its proper divisors (32093541868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31223121332 is a wasteful number, since it uses less digits than its factorization.

31223121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085 (or 2083 counting only the distinct ones).

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

Adding to 31223121332 its reverse (23312132213), we get a palindrome (54535253545).

The spelling of 31223121332 in words is "thirty-one billion, two hundred twenty-three million, one hundred twenty-one thousand, three hundred thirty-two".