131221121324 has 6 divisors (see below), whose sum is σ = 229636962324. Its totient is φ = 65610560660.

The previous prime is 131221121309. The next prime is 131221121327. The reversal of 131221121324 is 423121122131.

It is a self number, because there is not a number n which added to its sum of digits gives 131221121324.

It is not an unprimeable number, because it can be changed into a prime (131221121327) 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, 16402640162 + ... + 16402640169.

It is an arithmetic number, because the mean of its divisors is an integer number (38272827054).

Almost surely, 2^131221121324 is an apocalyptic number.

It is an amenable number.

131221121324 is a deficient number, since it is larger than the sum of its proper divisors (98415841000).

131221121324 is a wasteful number, since it uses less digits than its factorization.

131221121324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32805280335 (or 32805280333 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

Adding to 131221121324 its reverse (423121122131), we get a palindrome (554342243455).

The spelling of 131221121324 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty-four".