16161110050021 has 2 divisors, whose sum is σ = 16161110050022. Its totient is φ = 16161110050020.

The previous prime is 16161110049943. The next prime is 16161110050037. The reversal of 16161110050021 is 12005001116161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15743000385025 + 418109664996 = 3967745^2 + 646614^2 .

It is a cyclic number.

It is not a de Polignac number, because 16161110050021 - 2⁹ = 16161110049509 is a prime.

It is a super-2 number, since 2×16161110050021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16161110050091) 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, 8080555025010 + 8080555025011.

It is an arithmetic number, because the mean of its divisors is an integer number (8080555025011).

Almost surely, 2^{16161110050021} is an apocalyptic number.

It is an amenable number.

16161110050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16161110050021 is an equidigital number, since it uses as much as digits as its factorization.

16161110050021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 25.

Adding to 16161110050021 its reverse (12005001116161), we get a palindrome (28166111166182).

The spelling of 16161110050021 in words is "sixteen trillion, one hundred sixty-one billion, one hundred ten million, fifty thousand, twenty-one".