353540221 has 2 divisors, whose sum is σ = 353540222. Its totient is φ = 353540220.

The previous prime is 353540203. The next prime is 353540233. The reversal of 353540221 is 122045353.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312759225 + 40780996 = 17685^2 + 6386^2 .

It is an emirp because it is prime and its reverse (122045353) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 353540221 - 2⁷ = 353540093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (353540261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176770110 + 176770111.

It is an arithmetic number, because the mean of its divisors is an integer number (176770111).

Almost surely, 2^353540221 is an apocalyptic number.

It is an amenable number.

353540221 is a deficient number, since it is larger than the sum of its proper divisors (1).

353540221 is an equidigital number, since it uses as much as digits as its factorization.

353540221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 353540221 is about 18802.6652632014. The cubic root of 353540221 is about 707.0980013487.

Adding to 353540221 its reverse (122045353), we get a palindrome (475585574).

The spelling of 353540221 in words is "three hundred fifty-three million, five hundred forty thousand, two hundred twenty-one".