221120165 has 8 divisors (see below), whose sum is σ = 303250560. Its totient is φ = 151625232.

The previous prime is 221120161. The next prime is 221120197. The reversal of 221120165 is 561021122.

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 221120165 - 2² = 221120161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3158825 + ... + 3158894.

It is an arithmetic number, because the mean of its divisors is an integer number (37906320).

Almost surely, 2^221120165 is an apocalyptic number.

It is an amenable number.

221120165 is a deficient number, since it is larger than the sum of its proper divisors (82130395).

221120165 is an equidigital number, since it uses as much as digits as its factorization.

221120165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317731.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 221120165 is about 14870.1097843963. The cubic root of 221120165 is about 604.7039190546.

Adding to 221120165 its reverse (561021122), we get a palindrome (782141287).

The spelling of 221120165 in words is "two hundred twenty-one million, one hundred twenty thousand, one hundred sixty-five".