160221321 has 48 divisors (see below), whose sum is σ = 262668224. Its totient is φ = 96997824.

The previous prime is 160221301. The next prime is 160221329. The reversal of 160221321 is 123122061.

It is not a de Polignac number, because 160221321 - 2¹³ = 160213129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 160221294 and 160221303.

It is not an unprimeable number, because it can be changed into a prime (160221329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211275 + ... + 212031.

Almost surely, 2^160221321 is an apocalyptic number.

It is an amenable number.

160221321 is a deficient number, since it is larger than the sum of its proper divisors (102446903).

160221321 is an equidigital number, since it uses as much as digits as its factorization.

160221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 160221321 is about 12657.8560980918. The cubic root of 160221321 is about 543.1337236662.

Adding to 160221321 its reverse (123122061), we get a palindrome (283343382).

The spelling of 160221321 in words is "one hundred sixty million, two hundred twenty-one thousand, three hundred twenty-one".