131213323221 has 12 divisors (see below), whose sum is σ = 179807306112. Its totient is φ = 85111342128.

The previous prime is 131213323217. The next prime is 131213323253. The reversal of 131213323221 is 122323312131.

It is not a de Polignac number, because 131213323221 - 2² = 131213323217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131213323191 and 131213323200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131213323261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15970245 + ... + 15978458.

It is an arithmetic number, because the mean of its divisors is an integer number (14983942176).

Almost surely, 2^131213323221 is an apocalyptic number.

It is an amenable number.

131213323221 is a deficient number, since it is larger than the sum of its proper divisors (48593982891).

131213323221 is an equidigital number, since it uses as much as digits as its factorization.

131213323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31948780 (or 31948743 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

Adding to 131213323221 its reverse (122323312131), we get a palindrome (253536635352).

The spelling of 131213323221 in words is "one hundred thirty-one billion, two hundred thirteen million, three hundred twenty-three thousand, two hundred twenty-one".