316320142244221 has 2 divisors, whose sum is σ = 316320142244222. Its totient is φ = 316320142244220.

The previous prime is 316320142244207. The next prime is 316320142244243. The reversal of 316320142244221 is 122442241023613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265455788038596 + 50864354205625 = 16292814^2 + 7131925^2 .

It is a cyclic number.

It is not a de Polignac number, because 316320142244221 - 2²¹ = 316320140147069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316320142244921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158160071122110 + 158160071122111.

It is an arithmetic number, because the mean of its divisors is an integer number (158160071122111).

Almost surely, 2^{316320142244221} is an apocalyptic number.

It is an amenable number.

316320142244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

316320142244221 is an equidigital number, since it uses as much as digits as its factorization.

316320142244221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 316320142244221 its reverse (122442241023613), we get a palindrome (438762383267834).

The spelling of 316320142244221 in words is "three hundred sixteen trillion, three hundred twenty billion, one hundred forty-two million, two hundred forty-four thousand, two hundred twenty-one".