31321121012 has 24 divisors (see below), whose sum is σ = 55487323080. Its totient is φ = 15467978240.

The previous prime is 31321120997. The next prime is 31321121017. The reversal of 31321121012 is 21012112313.

It can be written as a sum of positive squares in 4 ways, for example, as 6405761296 + 24915359716 = 80036^2 + 157846^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321121017) 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 7 ways as a sum of consecutive naturals, for example, 288248 + ... + 381744.

It is an arithmetic number, because the mean of its divisors is an integer number (2311971795).

Almost surely, 2^31321121012 is an apocalyptic number.

It is an amenable number.

31321121012 is a deficient number, since it is larger than the sum of its proper divisors (24166202068).

31321121012 is a wasteful number, since it uses less digits than its factorization.

31321121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94531 (or 94529 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31321121012 its reverse (21012112313), we get a palindrome (52333233325).

The spelling of 31321121012 in words is "thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, twelve".