31203213312 has 240 divisors, whose sum is σ = 89178667200. Its totient is φ = 9669967872.

The previous prime is 31203213211. The next prime is 31203213313. The reversal of 31203213312 is 21331230213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203213313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89407314 + ... + 89407662.

It is an arithmetic number, because the mean of its divisors is an integer number (371577780).

Almost surely, 2^31203213312 is an apocalyptic number.

31203213312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31203213312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44589333600).

31203213312 is an abundant number, since it is smaller than the sum of its proper divisors (57975453888).

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

31203213312 is a wasteful number, since it uses less digits than its factorization.

31203213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31203213312 its reverse (21331230213), we get a palindrome (52534443525).

The spelling of 31203213312 in words is "thirty-one billion, two hundred three million, two hundred thirteen thousand, three hundred twelve".