162220321 has 4 divisors (see below), whose sum is σ = 166604692. Its totient is φ = 157835952.

The previous prime is 162220319. The next prime is 162220327. The reversal of 162220321 is 123022261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123022261 = 181 ⋅679681.

It can be written as a sum of positive squares in 2 ways, for example, as 83010321 + 79210000 = 9111^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 162220321 - 2¹ = 162220319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162220327) 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, 2192130 + ... + 2192203.

It is an arithmetic number, because the mean of its divisors is an integer number (41651173).

Almost surely, 2^162220321 is an apocalyptic number.

It is an amenable number.

162220321 is a deficient number, since it is larger than the sum of its proper divisors (4384371).

162220321 is an equidigital number, since it uses as much as digits as its factorization.

162220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384370.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 162220321 is about 12736.5741469204. The cubic root of 162220321 is about 545.3831954240.

Adding to 162220321 its reverse (123022261), we get a palindrome (285242582).

The spelling of 162220321 in words is "one hundred sixty-two million, two hundred twenty thousand, three hundred twenty-one".