131423131421221 has 4 divisors (see below), whose sum is σ = 137137180613472. Its totient is φ = 125709082228972.

The previous prime is 131423131421209. The next prime is 131423131421227. The reversal of 131423131421221 is 122124131324131.

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 131423131421221 - 2⁹ = 131423131420709 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 (131423131421227) 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, 2857024596091 + ... + 2857024596136.

It is an arithmetic number, because the mean of its divisors is an integer number (34284295153368).

Almost surely, 2^{131423131421221} is an apocalyptic number.

It is an amenable number.

131423131421221 is a deficient number, since it is larger than the sum of its proper divisors (5714049192251).

131423131421221 is an equidigital number, since it uses as much as digits as its factorization.

131423131421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5714049192250.

The product of its digits is 6912, while the sum is 31.

Adding to 131423131421221 its reverse (122124131324131), we get a palindrome (253547262745352).

The spelling of 131423131421221 in words is "one hundred thirty-one trillion, four hundred twenty-three billion, one hundred thirty-one million, four hundred twenty-one thousand, two hundred twenty-one".