1321528172911 has 2 divisors, whose sum is σ = 1321528172912. Its totient is φ = 1321528172910.

The previous prime is 1321528172851. The next prime is 1321528173037. The reversal of 1321528172911 is 1192718251231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321528172911 - 2²³ = 1321519784303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321528178911) 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, 660764086455 + 660764086456.

It is an arithmetic number, because the mean of its divisors is an integer number (660764086456).

Almost surely, 2^{1321528172911} is an apocalyptic number.

1321528172911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321528172911 is an equidigital number, since it uses as much as digits as its factorization.

1321528172911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 43.

The spelling of 1321528172911 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-eight million, one hundred seventy-two thousand, nine hundred eleven".