16206121130521 has 6 divisors (see below), whose sum is σ = 18852018458010. Its totient is φ = 13890960968976.

The previous prime is 16206121130519. The next prime is 16206121130527. The reversal of 16206121130521 is 12503112160261.

It can be written as a sum of positive squares in only one way, i.e., 14412501104400 + 1793620026121 = 3796380^2 + 1339261^2 .

It is not a de Polignac number, because 16206121130521 - 2¹ = 16206121130519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16206121130527) 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 in 5 ways as a sum of consecutive naturals, for example, 165368582916 + ... + 165368583013.

It is an arithmetic number, because the mean of its divisors is an integer number (3142003076335).

Almost surely, 2^{16206121130521} is an apocalyptic number.

It is an amenable number.

16206121130521 is a deficient number, since it is larger than the sum of its proper divisors (2645897327489).

16206121130521 is an equidigital number, since it uses as much as digits as its factorization.

16206121130521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330737165943 (or 330737165936 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 16206121130521 its reverse (12503112160261), we get a palindrome (28709233290782).

The spelling of 16206121130521 in words is "sixteen trillion, two hundred six billion, one hundred twenty-one million, one hundred thirty thousand, five hundred twenty-one".