316253620356221 has 2 divisors, whose sum is σ = 316253620356222. Its totient is φ = 316253620356220.

The previous prime is 316253620356209. The next prime is 316253620356307. The reversal of 316253620356221 is 122653026352613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304229294308900 + 12024326047321 = 17442170^2 + 3467611^2 .

It is a cyclic number.

It is not a de Polignac number, because 316253620356221 - 2¹⁴ = 316253620339837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316253620356721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158126810178110 + 158126810178111.

It is an arithmetic number, because the mean of its divisors is an integer number (158126810178111).

Almost surely, 2^{316253620356221} is an apocalyptic number.

It is an amenable number.

316253620356221 is a deficient number, since it is larger than the sum of its proper divisors (1).

316253620356221 is an equidigital number, since it uses as much as digits as its factorization.

316253620356221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 316253620356221 in words is "three hundred sixteen trillion, two hundred fifty-three billion, six hundred twenty million, three hundred fifty-six thousand, two hundred twenty-one".