320203033031221 has 2 divisors, whose sum is σ = 320203033031222. Its totient is φ = 320203033031220.

The previous prime is 320203033031207. The next prime is 320203033031341. The reversal of 320203033031221 is 122130330302023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181411401899025 + 138791631132196 = 13468905^2 + 11780986^2 .

It is an emirp because it is prime and its reverse (122130330302023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320203033031221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320203033031201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160101516515610 + 160101516515611.

It is an arithmetic number, because the mean of its divisors is an integer number (160101516515611).

Almost surely, 2^{320203033031221} is an apocalyptic number.

It is an amenable number.

320203033031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320203033031221 is an equidigital number, since it uses as much as digits as its factorization.

320203033031221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 320203033031221 its reverse (122130330302023), we get a palindrome (442333363333244).

The spelling of 320203033031221 in words is "three hundred twenty trillion, two hundred three billion, thirty-three million, thirty-one thousand, two hundred twenty-one".