31221113320 has 32 divisors (see below), whose sum is σ = 70313809320. Its totient is φ = 12476657920.

The previous prime is 31221113303. The next prime is 31221113321. The reversal of 31221113320 is 2331112213.

It can be written as a sum of positive squares in 4 ways, for example, as 22397516964 + 8823596356 = 149658^2 + 93934^2 .

It is not an unprimeable number, because it can be changed into a prime (31221113321) 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 7 ways as a sum of consecutive naturals, for example, 325387 + ... + 410266.

Almost surely, 2^31221113320 is an apocalyptic number.

It is an amenable number.

31221113320 is an abundant number, since it is smaller than the sum of its proper divisors (39092696000).

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

31221113320 is a wasteful number, since it uses less digits than its factorization.

31221113320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736725 (or 736721 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31221113320 its reverse (2331112213), we get a palindrome (33552225533).

The spelling of 31221113320 in words is "thirty-one billion, two hundred twenty-one million, one hundred thirteen thousand, three hundred twenty".