31210321012 has 96 divisors (see below), whose sum is σ = 63904159872. Its totient is φ = 13208334336.

The previous prime is 31210320997. The next prime is 31210321013. The reversal of 31210321012 is 21012301213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31210321013) 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 31 ways as a sum of consecutive naturals, for example, 5353243 + ... + 5359069.

It is an arithmetic number, because the mean of its divisors is an integer number (665668332).

Almost surely, 2^31210321012 is an apocalyptic number.

It is an amenable number.

31210321012 is an abundant number, since it is smaller than the sum of its proper divisors (32693838860).

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

31210321012 is a wasteful number, since it uses less digits than its factorization.

31210321012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6017 (or 6015 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31210321012 its reverse (21012301213), we get a palindrome (52222622225).

The spelling of 31210321012 in words is "thirty-one billion, two hundred ten million, three hundred twenty-one thousand, twelve".