352243037450221 has 2 divisors, whose sum is σ = 352243037450222. Its totient is φ = 352243037450220.

The previous prime is 352243037450219. The next prime is 352243037450257. The reversal of 352243037450221 is 122054730342253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308329367676100 + 43913669774121 = 17559310^2 + 6626739^2 .

It is a cyclic number.

It is not a de Polignac number, because 352243037450221 - 2¹ = 352243037450219 is a prime.

Together with 352243037450219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (352243037450261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176121518725110 + 176121518725111.

It is an arithmetic number, because the mean of its divisors is an integer number (176121518725111).

Almost surely, 2^{352243037450221} is an apocalyptic number.

It is an amenable number.

352243037450221 is a deficient number, since it is larger than the sum of its proper divisors (1).

352243037450221 is an equidigital number, since it uses as much as digits as its factorization.

352243037450221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 43.

Adding to 352243037450221 its reverse (122054730342253), we get a palindrome (474297767792474).

The spelling of 352243037450221 in words is "three hundred fifty-two trillion, two hundred forty-three billion, thirty-seven million, four hundred fifty thousand, two hundred twenty-one".