131311222021321 has 4 divisors (see below), whose sum is σ = 135839195194500. Its totient is φ = 126783248848144.

The previous prime is 131311222021297. The next prime is 131311222021327. The reversal of 131311222021321 is 123120222113131.

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 42634892611600 + 88676329409721 = 6529540^2 + 9416811^2 .

It is a cyclic number.

It is not a de Polignac number, because 131311222021321 - 2⁷ = 131311222021193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131311222021327) 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, 2263986586546 + ... + 2263986586603.

It is an arithmetic number, because the mean of its divisors is an integer number (33959798798625).

Almost surely, 2^{131311222021321} is an apocalyptic number.

It is an amenable number.

131311222021321 is a deficient number, since it is larger than the sum of its proper divisors (4527973173179).

131311222021321 is an equidigital number, since it uses as much as digits as its factorization.

131311222021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527973173178.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 131311222021321 its reverse (123120222113131), we get a palindrome (254431444134452).

The spelling of 131311222021321 in words is "one hundred thirty-one trillion, three hundred eleven billion, two hundred twenty-two million, twenty-one thousand, three hundred twenty-one".