31203221012 has 6 divisors (see below), whose sum is σ = 54605636778. Its totient is φ = 15601610504.

The previous prime is 31203220957. The next prime is 31203221017. The reversal of 31203221012 is 21012230213.

It can be written as a sum of positive squares in only one way, i.e., 30606102916 + 597118096 = 174946^2 + 24436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203221017) 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 as a sum of consecutive naturals, namely, 3900402623 + ... + 3900402630.

It is an arithmetic number, because the mean of its divisors is an integer number (9100939463).

Almost surely, 2^31203221012 is an apocalyptic number.

It is an amenable number.

31203221012 is a deficient number, since it is larger than the sum of its proper divisors (23402415766).

31203221012 is a wasteful number, since it uses less digits than its factorization.

31203221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800805257 (or 7800805255 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31203221012 its reverse (21012230213), we get a palindrome (52215451225).

The spelling of 31203221012 in words is "thirty-one billion, two hundred three million, two hundred twenty-one thousand, twelve".