131311223133221 has 4 divisors (see below), whose sum is σ = 131325099421152. Its totient is φ = 131297346845292.

The previous prime is 131311223133197. The next prime is 131311223133269. The reversal of 131311223133221 is 122331322113131.

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 not a de Polignac number, because 131311223133221 - 2³⁴ = 131294043264037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311223133271) 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, 6938129771 + ... + 6938148696.

It is an arithmetic number, because the mean of its divisors is an integer number (32831274855288).

Almost surely, 2^{131311223133221} is an apocalyptic number.

It is an amenable number.

131311223133221 is a deficient number, since it is larger than the sum of its proper divisors (13876287931).

131311223133221 is an equidigital number, since it uses as much as digits as its factorization.

131311223133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13876287930.

The product of its digits is 3888, while the sum is 29.

Adding to 131311223133221 its reverse (122331322113131), we get a palindrome (253642545246352).

The spelling of 131311223133221 in words is "one hundred thirty-one trillion, three hundred eleven billion, two hundred twenty-three million, one hundred thirty-three thousand, two hundred twenty-one".