131311103321221 has 4 divisors (see below), whose sum is σ = 133109885558572. Its totient is φ = 129512321083872.

The previous prime is 131311103321201. The next prime is 131311103321227. The reversal of 131311103321221 is 122123301113131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65047612344100 + 66263490977121 = 8065210^2 + 8140239^2 .

It is a cyclic number.

It is not a de Polignac number, because 131311103321221 - 2¹³ = 131311103313029 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 (131311103321227) 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, 899391118566 + ... + 899391118711.

It is an arithmetic number, because the mean of its divisors is an integer number (33277471389643).

Almost surely, 2^{131311103321221} is an apocalyptic number.

It is an amenable number.

131311103321221 is a deficient number, since it is larger than the sum of its proper divisors (1798782237351).

131311103321221 is an equidigital number, since it uses as much as digits as its factorization.

131311103321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798782237350.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 131311103321221 its reverse (122123301113131), we get a palindrome (253434404434352).

The spelling of 131311103321221 in words is "one hundred thirty-one trillion, three hundred eleven billion, one hundred three million, three hundred twenty-one thousand, two hundred twenty-one".