31222320008221 has 2 divisors, whose sum is σ = 31222320008222. Its totient is φ = 31222320008220.

The previous prime is 31222320008213. The next prime is 31222320008237. The reversal of 31222320008221 is 12280002322213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25343028682596 + 5879291325625 = 5034186^2 + 2424725^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222320008221 - 2³ = 31222320008213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31222320008221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31222320008251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611160004110 + 15611160004111.

It is an arithmetic number, because the mean of its divisors is an integer number (15611160004111).

Almost surely, 2^{31222320008221} is an apocalyptic number.

It is an amenable number.

31222320008221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222320008221 is an equidigital number, since it uses as much as digits as its factorization.

31222320008221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 31222320008221 in words is "thirty-one trillion, two hundred twenty-two billion, three hundred twenty million, eight thousand, two hundred twenty-one".