31023221203212 has 96 divisors (see below), whose sum is σ = 83518058975232. Its totient is φ = 8779566632256.

The previous prime is 31023221203207. The next prime is 31023221203217. The reversal of 31023221203212 is 21230212232013.

It is an interprime number because it is at equal distance from previous prime (31023221203207) and next prime (31023221203217).

It is a super-2 number, since 2×31023221203212² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31023221203217) 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, 62643 + ... + 7877205.

It is an arithmetic number, because the mean of its divisors is an integer number (869979780992).

Almost surely, 2^{31023221203212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31023221203212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41759029487616).

31023221203212 is an abundant number, since it is smaller than the sum of its proper divisors (52494837772020).

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

31023221203212 is a wasteful number, since it uses less digits than its factorization.

31023221203212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7815027 (or 7815025 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31023221203212 its reverse (21230212232013), we get a palindrome (52253433435225).

The spelling of 31023221203212 in words is "thirty-one trillion, twenty-three billion, two hundred twenty-one million, two hundred three thousand, two hundred twelve".