131021012321 has 2 divisors, whose sum is σ = 131021012322. Its totient is φ = 131021012320.

The previous prime is 131021012293. The next prime is 131021012351. The reversal of 131021012321 is 123210120131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119982568225 + 11038444096 = 346385^2 + 105064^2 .

It is a cyclic number.

It is not a de Polignac number, because 131021012321 - 2²² = 131016818017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131021012321.

It is not a weakly prime, because it can be changed into another prime (131021012351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510506160 + 65510506161.

It is an arithmetic number, because the mean of its divisors is an integer number (65510506161).

Almost surely, 2^131021012321 is an apocalyptic number.

It is an amenable number.

131021012321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021012321 is an equidigital number, since it uses as much as digits as its factorization.

131021012321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 131021012321 its reverse (123210120131), we get a palindrome (254231132452).

The spelling of 131021012321 in words is "one hundred thirty-one billion, twenty-one million, twelve thousand, three hundred twenty-one".