131212302443221 has 4 divisors (see below), whose sum is σ = 131228181950752. Its totient is φ = 131196422935692.

The previous prime is 131212302443219. The next prime is 131212302443239. The reversal of 131212302443221 is 122344203212131.

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 131212302443221 - 2¹ = 131212302443219 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 (131212302443021) 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, 7939741371 + ... + 7939757896.

It is an arithmetic number, because the mean of its divisors is an integer number (32807045487688).

Almost surely, 2^{131212302443221} is an apocalyptic number.

It is an amenable number.

131212302443221 is a deficient number, since it is larger than the sum of its proper divisors (15879507531).

131212302443221 is an equidigital number, since it uses as much as digits as its factorization.

131212302443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15879507530.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 131212302443221 its reverse (122344203212131), we get a palindrome (253556505655352).

The spelling of 131212302443221 in words is "one hundred thirty-one trillion, two hundred twelve billion, three hundred two million, four hundred forty-three thousand, two hundred twenty-one".