171220055221 has 8 divisors (see below), whose sum is σ = 178734723840. Its totient is φ = 163711246512.

The previous prime is 171220055191. The next prime is 171220055231. The reversal of 171220055221 is 122550022171.

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 171220055221 - 2³³ = 162630120629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171220055221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171220055231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405206 + ... + 1522183.

It is an arithmetic number, because the mean of its divisors is an integer number (22341840480).

Almost surely, 2^171220055221 is an apocalyptic number.

It is an amenable number.

171220055221 is a deficient number, since it is larger than the sum of its proper divisors (7514668619).

171220055221 is a wasteful number, since it uses less digits than its factorization.

171220055221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929955.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 171220055221 its reverse (122550022171), we get a palindrome (293770077392).

The spelling of 171220055221 in words is "one hundred seventy-one billion, two hundred twenty million, fifty-five thousand, two hundred twenty-one".