131221120333 has 4 divisors (see below), whose sum is σ = 131221872928. Its totient is φ = 131220367740.

The previous prime is 131221120309. The next prime is 131221120339. The reversal of 131221120333 is 333021122131.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 333021122131 = 24547 ⋅13566673.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221120333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221120339) 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, 35338 + ... + 513508.

It is an arithmetic number, because the mean of its divisors is an integer number (32805468232).

Almost surely, 2^131221120333 is an apocalyptic number.

It is an amenable number.

131221120333 is a deficient number, since it is larger than the sum of its proper divisors (752595).

131221120333 is an equidigital number, since it uses as much as digits as its factorization.

131221120333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752594.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131221120333 its reverse (333021122131), we get a palindrome (464242242464).

The spelling of 131221120333 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty thousand, three hundred thirty-three".