321220111221641 has 2 divisors, whose sum is σ = 321220111221642. Its totient is φ = 321220111221640.

The previous prime is 321220111221557. The next prime is 321220111221679. The reversal of 321220111221641 is 146122111022123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276065003961616 + 45155107260025 = 16615204^2 + 6719755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321220111221641 is a prime.

It is not a weakly prime, because it can be changed into another prime (321220111521641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610055610820 + 160610055610821.

It is an arithmetic number, because the mean of its divisors is an integer number (160610055610821).

Almost surely, 2^{321220111221641} is an apocalyptic number.

It is an amenable number.

321220111221641 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220111221641 is an equidigital number, since it uses as much as digits as its factorization.

321220111221641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 321220111221641 its reverse (146122111022123), we get a palindrome (467342222243764).

The spelling of 321220111221641 in words is "three hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, six hundred forty-one".