320105221 has 4 divisors (see below), whose sum is σ = 320638444. Its totient is φ = 319572000.

The previous prime is 320105129. The next prime is 320105239. The reversal of 320105221 is 122501023.

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 141348321 + 178756900 = 11889^2 + 13370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320105221 is a prime.

It is a super-2 number, since 2×320105221² = 204934705022917682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320105195 and 320105204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320105251) 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, 265710 + ... + 266911.

It is an arithmetic number, because the mean of its divisors is an integer number (80159611).

Almost surely, 2^320105221 is an apocalyptic number.

It is an amenable number.

320105221 is a deficient number, since it is larger than the sum of its proper divisors (533223).

320105221 is an equidigital number, since it uses as much as digits as its factorization.

320105221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533222.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 320105221 is about 17891.4845946333. The cubic root of 320105221 is about 684.0653393631.

Adding to 320105221 its reverse (122501023), we get a palindrome (442606244).

The spelling of 320105221 in words is "three hundred twenty million, one hundred five thousand, two hundred twenty-one".