320032221 has 4 divisors (see below), whose sum is σ = 426709632. Its totient is φ = 213354812.

The previous prime is 320032217. The next prime is 320032243. The reversal of 320032221 is 122230023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122230023 = 3 ⋅40743341.

It is a cyclic number.

It is not a de Polignac number, because 320032221 - 2² = 320032217 is a prime.

It is a super-3 number, since 3×320032221³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320032211) 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, 53338701 + ... + 53338706.

It is an arithmetic number, because the mean of its divisors is an integer number (106677408).

Almost surely, 2^320032221 is an apocalyptic number.

It is an amenable number.

320032221 is a deficient number, since it is larger than the sum of its proper divisors (106677411).

320032221 is a wasteful number, since it uses less digits than its factorization.

320032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106677410.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320032221 is about 17889.4444016576. Note that the first 4 decimals coincide. The cubic root of 320032221 is about 684.0133350398.

Adding to 320032221 its reverse (122230023), we get a palindrome (442262244).

The spelling of 320032221 in words is "three hundred twenty million, thirty-two thousand, two hundred twenty-one".