16532320075421 has 2 divisors, whose sum is σ = 16532320075422. Its totient is φ = 16532320075420.

The previous prime is 16532320075409. The next prime is 16532320075471. The reversal of 16532320075421 is 12457002323561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13597368626521 + 2934951448900 = 3687461^2 + 1713170^2 .

It is a cyclic number.

It is not a de Polignac number, because 16532320075421 - 2¹⁴ = 16532320059037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16532320075471) 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, 8266160037710 + 8266160037711.

It is an arithmetic number, because the mean of its divisors is an integer number (8266160037711).

Almost surely, 2^{16532320075421} is an apocalyptic number.

It is an amenable number.

16532320075421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16532320075421 is an equidigital number, since it uses as much as digits as its factorization.

16532320075421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

Adding to 16532320075421 its reverse (12457002323561), we get a palindrome (28989322398982).

The spelling of 16532320075421 in words is "sixteen trillion, five hundred thirty-two billion, three hundred twenty million, seventy-five thousand, four hundred twenty-one".