385818222221 has 2 divisors, whose sum is σ = 385818222222. Its totient is φ = 385818222220.

The previous prime is 385818222191. The next prime is 385818222289. The reversal of 385818222221 is 122222818583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359536948996 + 26281273225 = 599614^2 + 162115^2 .

It is an emirp because it is prime and its reverse (122222818583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385818222221 - 2¹⁴ = 385818205837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385818221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192909111110 + 192909111111.

It is an arithmetic number, because the mean of its divisors is an integer number (192909111111).

Almost surely, 2^385818222221 is an apocalyptic number.

It is an amenable number.

385818222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

385818222221 is an equidigital number, since it uses as much as digits as its factorization.

385818222221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245760, while the sum is 44.

The spelling of 385818222221 in words is "three hundred eighty-five billion, eight hundred eighteen million, two hundred twenty-two thousand, two hundred twenty-one".