171000016021 has 2 divisors, whose sum is σ = 171000016022. Its totient is φ = 171000016020.

The previous prime is 171000016003. The next prime is 171000016051. The reversal of 171000016021 is 120610000171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169817343921 + 1182672100 = 412089^2 + 34390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171000016021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171000016021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171000016051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85500008010 + 85500008011.

It is an arithmetic number, because the mean of its divisors is an integer number (85500008011).

Almost surely, 2^171000016021 is an apocalyptic number.

It is an amenable number.

171000016021 is a deficient number, since it is larger than the sum of its proper divisors (1).

171000016021 is an equidigital number, since it uses as much as digits as its factorization.

171000016021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 171000016021 its reverse (120610000171), we get a palindrome (291610016192).

The spelling of 171000016021 in words is "one hundred seventy-one billion, sixteen thousand, twenty-one".