31021021320312 has 64 divisors (see below), whose sum is σ = 81683357184000. Its totient is φ = 9790221129984.

The previous prime is 31021021320277. The next prime is 31021021320313. The reversal of 31021021320312 is 21302312012013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021021320313) 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 15 ways as a sum of consecutive naturals, for example, 19695237 + ... + 21211892.

It is an arithmetic number, because the mean of its divisors is an integer number (1276302456000).

Almost surely, 2^{31021021320312} is an apocalyptic number.

It is an amenable number.

31021021320312 is an abundant number, since it is smaller than the sum of its proper divisors (50662335863688).

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

31021021320312 is a wasteful number, since it uses less digits than its factorization.

31021021320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40908820 (or 40908816 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31021021320312 its reverse (21302312012013), we get a palindrome (52323333332325).

The spelling of 31021021320312 in words is "thirty-one trillion, twenty-one billion, twenty-one million, three hundred twenty thousand, three hundred twelve".