355512221 has 2 divisors, whose sum is σ = 355512222. Its totient is φ = 355512220.

The previous prime is 355512197. The next prime is 355512259. The reversal of 355512221 is 122215553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211848025 + 143664196 = 14555^2 + 11986^2 .

It is an emirp because it is prime and its reverse (122215553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 355512221 - 2¹⁰ = 355511197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355515221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177756110 + 177756111.

It is an arithmetic number, because the mean of its divisors is an integer number (177756111).

Almost surely, 2^355512221 is an apocalyptic number.

It is an amenable number.

355512221 is a deficient number, since it is larger than the sum of its proper divisors (1).

355512221 is an equidigital number, since it uses as much as digits as its factorization.

355512221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 26.

The square root of 355512221 is about 18855.0317156986. The cubic root of 355512221 is about 708.4102638044.

Adding to 355512221 its reverse (122215553), we get a palindrome (477727774).

The spelling of 355512221 in words is "three hundred fifty-five million, five hundred twelve thousand, two hundred twenty-one".