171002001221 has 8 divisors (see below), whose sum is σ = 172720241400. Its totient is φ = 169284254400.

The previous prime is 171002001217. The next prime is 171002001223. The reversal of 171002001221 is 122100200171.

171002001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 85591938721 + 85410062500 = 292561^2 + 292250^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171002001221 - 2² = 171002001217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 171002001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171002001223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594215 + ... + 833723.

It is an arithmetic number, because the mean of its divisors is an integer number (21590030175).

Almost surely, 2^171002001221 is an apocalyptic number.

It is an amenable number.

171002001221 is a deficient number, since it is larger than the sum of its proper divisors (1718240179).

171002001221 is a wasteful number, since it uses less digits than its factorization.

171002001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246679.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 171002001221 its reverse (122100200171), we get a palindrome (293102201392).

The spelling of 171002001221 in words is "one hundred seventy-one billion, two million, one thousand, two hundred twenty-one".