31303321212 has 24 divisors (see below), whose sum is σ = 77337617616. Its totient is φ = 9820649728.

The previous prime is 31303321211. The next prime is 31303321219. The reversal of 31303321212 is 21212330313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303321211) 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, 76723623 + ... + 76724030.

It is an arithmetic number, because the mean of its divisors is an integer number (3222400734).

Almost surely, 2^31303321212 is an apocalyptic number.

It is an amenable number.

31303321212 is an abundant number, since it is smaller than the sum of its proper divisors (46034296404).

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

31303321212 is a wasteful number, since it uses less digits than its factorization.

31303321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153447677 (or 153447675 counting only the distinct ones).

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

Adding to 31303321212 its reverse (21212330313), we get a palindrome (52515651525).

The spelling of 31303321212 in words is "thirty-one billion, three hundred three million, three hundred twenty-one thousand, two hundred twelve".