131221031012 has 24 divisors (see below), whose sum is σ = 235004120736. Its totient is φ = 64077346368.

The previous prime is 131221030999. The next prime is 131221031021. The reversal of 131221031012 is 210130122131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652483 + ... + 1730069.

It is an arithmetic number, because the mean of its divisors is an integer number (9791838364).

Almost surely, 2^131221031012 is an apocalyptic number.

It is an amenable number.

131221031012 is a deficient number, since it is larger than the sum of its proper divisors (103783089724).

131221031012 is a wasteful number, since it uses less digits than its factorization.

131221031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87467 (or 87465 counting only the distinct ones).

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

Adding to 131221031012 its reverse (210130122131), we get a palindrome (341351153143).

The spelling of 131221031012 in words is "one hundred thirty-one billion, two hundred twenty-one million, thirty-one thousand, twelve".