165221327 has 4 divisors (see below), whose sum is σ = 165711936. Its totient is φ = 164730720.

The previous prime is 165221293. The next prime is 165221333. The reversal of 165221327 is 723122561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165221327 - 2¹⁰ = 165220303 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 165221327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244799 + ... + 245472.

It is an arithmetic number, because the mean of its divisors is an integer number (41427984).

Almost surely, 2^165221327 is an apocalyptic number.

165221327 is a deficient number, since it is larger than the sum of its proper divisors (490609).

165221327 is an equidigital number, since it uses as much as digits as its factorization.

165221327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490608.

The product of its digits is 5040, while the sum is 29.

The square root of 165221327 is about 12853.8448333563. The cubic root of 165221327 is about 548.7257852236.

Adding to 165221327 its reverse (723122561), we get a palindrome (888343888).

The spelling of 165221327 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred twenty-seven".