320106221 has 2 divisors, whose sum is σ = 320106222. Its totient is φ = 320106220.

The previous prime is 320106191. The next prime is 320106251. The reversal of 320106221 is 122601023.

It is a balanced prime because it is at equal distance from previous prime (320106191) and next prime (320106251).

It can be written as a sum of positive squares in only one way, i.e., 231952900 + 88153321 = 15230^2 + 9389^2 .

It is an emirp because it is prime and its reverse (122601023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320106221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320106221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320106251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160053110 + 160053111.

It is an arithmetic number, because the mean of its divisors is an integer number (160053111).

Almost surely, 2^320106221 is an apocalyptic number.

It is an amenable number.

320106221 is a deficient number, since it is larger than the sum of its proper divisors (1).

320106221 is an equidigital number, since it uses as much as digits as its factorization.

320106221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 320106221 is about 17891.5125408670. The cubic root of 320106221 is about 684.0660516962.

Adding to 320106221 its reverse (122601023), we get a palindrome (442707244).

The spelling of 320106221 in words is "three hundred twenty million, one hundred six thousand, two hundred twenty-one".