131221211233 has 4 divisors (see below), whose sum is σ = 149967098560. Its totient is φ = 112475323908.

The previous prime is 131221211221. The next prime is 131221211239. The reversal of 131221211233 is 332112122131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221211233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221211239) 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 3 ways as a sum of consecutive naturals, for example, 9372943653 + ... + 9372943666.

It is an arithmetic number, because the mean of its divisors is an integer number (37491774640).

Almost surely, 2^131221211233 is an apocalyptic number.

It is an amenable number.

131221211233 is a deficient number, since it is larger than the sum of its proper divisors (18745887327).

131221211233 is an equidigital number, since it uses as much as digits as its factorization.

131221211233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18745887326.

The product of its digits is 432, while the sum is 22.

Adding to 131221211233 its reverse (332112122131), we get a palindrome (463333333364).

The spelling of 131221211233 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-three".