31321121232012 has 24 divisors (see below), whose sum is σ = 73083830020656. Its totient is φ = 10440200342208.

The previous prime is 31321121231977. The next prime is 31321121232013. The reversal of 31321121232012 is 21023212112313.

It is not an unprimeable number, because it can be changed into a prime (31321121232013) 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, 20921563 + ... + 22368594.

It is an arithmetic number, because the mean of its divisors is an integer number (3045159584194).

Almost surely, 2^{31321121232012} is an apocalyptic number.

It is an amenable number.

31321121232012 is an abundant number, since it is smaller than the sum of its proper divisors (41762708788644).

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

31321121232012 is a wasteful number, since it uses less digits than its factorization.

31321121232012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43350457 (or 43350455 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31321121232012 its reverse (21023212112313), we get a palindrome (52344333344325).

The spelling of 31321121232012 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, twelve".