1321032420161 has 2 divisors, whose sum is σ = 1321032420162. Its totient is φ = 1321032420160.

The previous prime is 1321032419951. The next prime is 1321032420181. The reversal of 1321032420161 is 1610242301231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662571580225 + 658460839936 = 813985^2 + 811456^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321032420161 - 2²² = 1321028225857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321032420161.

It is not a weakly prime, because it can be changed into another prime (1321032420181) 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, 660516210080 + 660516210081.

It is an arithmetic number, because the mean of its divisors is an integer number (660516210081).

Almost surely, 2^{1321032420161} is an apocalyptic number.

It is an amenable number.

1321032420161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321032420161 is an equidigital number, since it uses as much as digits as its factorization.

1321032420161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1321032420161 its reverse (1610242301231), we get a palindrome (2931274721392).

The spelling of 1321032420161 in words is "one trillion, three hundred twenty-one billion, thirty-two million, four hundred twenty thousand, one hundred sixty-one".