355500320221 has 2 divisors, whose sum is σ = 355500320222. Its totient is φ = 355500320220.

The previous prime is 355500320213. The next prime is 355500320261. The reversal of 355500320221 is 122023005553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234406064025 + 121094256196 = 484155^2 + 347986^2 .

It is a cyclic number.

It is not a de Polignac number, because 355500320221 - 2³ = 355500320213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 355500320221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355500320261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177750160110 + 177750160111.

It is an arithmetic number, because the mean of its divisors is an integer number (177750160111).

Almost surely, 2^355500320221 is an apocalyptic number.

It is an amenable number.

355500320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

355500320221 is an equidigital number, since it uses as much as digits as its factorization.

355500320221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 355500320221 its reverse (122023005553), we get a palindrome (477523325774).

The spelling of 355500320221 in words is "three hundred fifty-five billion, five hundred million, three hundred twenty thousand, two hundred twenty-one".