131221240323443 has 4 divisors (see below), whose sum is σ = 131238720181800. Its totient is φ = 131203760465088.

The previous prime is 131221240323431. The next prime is 131221240323451. The reversal of 131221240323443 is 344323042122131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131221240323443 - 2¹⁶ = 131221240257907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221240323463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8739917918 + ... + 8739932931.

It is an arithmetic number, because the mean of its divisors is an integer number (32809680045450).

Almost surely, 2^{131221240323443} is an apocalyptic number.

131221240323443 is a deficient number, since it is larger than the sum of its proper divisors (17479858357).

131221240323443 is an equidigital number, since it uses as much as digits as its factorization.

131221240323443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17479858356.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 131221240323443 its reverse (344323042122131), we get a palindrome (475544282445574).

The spelling of 131221240323443 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred forty million, three hundred twenty-three thousand, four hundred forty-three".