171356107421 has 2 divisors, whose sum is σ = 171356107422. Its totient is φ = 171356107420.

The previous prime is 171356107399. The next prime is 171356107471. The reversal of 171356107421 is 124701653171.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89648743396 + 81707364025 = 299414^2 + 285845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171356107421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171356107471) 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, 85678053710 + 85678053711.

It is an arithmetic number, because the mean of its divisors is an integer number (85678053711).

Almost surely, 2^171356107421 is an apocalyptic number.

It is an amenable number.

171356107421 is a deficient number, since it is larger than the sum of its proper divisors (1).

171356107421 is an equidigital number, since it uses as much as digits as its factorization.

171356107421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 171356107421 in words is "one hundred seventy-one billion, three hundred fifty-six million, one hundred seven thousand, four hundred twenty-one".