320221001 has 4 divisors (see below), whose sum is σ = 320282004. Its totient is φ = 320160000.

The previous prime is 320220983. The next prime is 320221007. The reversal of 320221001 is 100122023.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 167055625 + 153165376 = 12925^2 + 12376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320221007) 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, 21800 + ... + 33401.

It is an arithmetic number, because the mean of its divisors is an integer number (80070501).

Almost surely, 2^320221001 is an apocalyptic number.

It is an amenable number.

320221001 is a deficient number, since it is larger than the sum of its proper divisors (61003).

320221001 is an equidigital number, since it uses as much as digits as its factorization.

320221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61002.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 320221001 is about 17894.7199195740. The cubic root of 320221001 is about 684.1478034332.

Adding to 320221001 its reverse (100122023), we get a palindrome (420343024).

The spelling of 320221001 in words is "three hundred twenty million, two hundred twenty-one thousand, one".