16536063311021 has 2 divisors, whose sum is σ = 16536063311022. Its totient is φ = 16536063311020.

The previous prime is 16536063310973. The next prime is 16536063311023. The reversal of 16536063311021 is 12011336063561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11200494597796 + 5335568713225 = 3346714^2 + 2309885^2 .

It is a cyclic number.

It is not a de Polignac number, because 16536063311021 - 2⁶ = 16536063310957 is a prime.

Together with 16536063311023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16536063311023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8268031655510 + 8268031655511.

It is an arithmetic number, because the mean of its divisors is an integer number (8268031655511).

Almost surely, 2^{16536063311021} is an apocalyptic number.

It is an amenable number.

16536063311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16536063311021 is an equidigital number, since it uses as much as digits as its factorization.

16536063311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

Adding to 16536063311021 its reverse (12011336063561), we get a palindrome (28547399374582).

The spelling of 16536063311021 in words is "sixteen trillion, five hundred thirty-six billion, sixty-three million, three hundred eleven thousand, twenty-one".