31323013212 has 24 divisors (see below), whose sum is σ = 74869642512. Its totient is φ = 10186345600.

The previous prime is 31323013157. The next prime is 31323013219. The reversal of 31323013212 is 21231032313.

It is a super-3 number, since 3×31323013212³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323013219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31831839 + ... + 31832822.

It is an arithmetic number, because the mean of its divisors is an integer number (3119568438).

Almost surely, 2^31323013212 is an apocalyptic number.

It is an amenable number.

31323013212 is an abundant number, since it is smaller than the sum of its proper divisors (43546629300).

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

31323013212 is a wasteful number, since it uses less digits than its factorization.

31323013212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63664709 (or 63664707 counting only the distinct ones).

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

Adding to 31323013212 its reverse (21231032313), we get a palindrome (52554045525).

The spelling of 31323013212 in words is "thirty-one billion, three hundred twenty-three million, thirteen thousand, two hundred twelve".