1315343450221 has 2 divisors, whose sum is σ = 1315343450222. Its totient is φ = 1315343450220.

The previous prime is 1315343450219. The next prime is 1315343450233. The reversal of 1315343450221 is 1220543435131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966310626121 + 349032824100 = 983011^2 + 590790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315343450221 - 2¹ = 1315343450219 is a prime.

Together with 1315343450219, 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 (1315343450251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657671725110 + 657671725111.

It is an arithmetic number, because the mean of its divisors is an integer number (657671725111).

Almost surely, 2^{1315343450221} is an apocalyptic number.

It is an amenable number.

1315343450221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315343450221 is an equidigital number, since it uses as much as digits as its factorization.

1315343450221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 1315343450221 its reverse (1220543435131), we get a palindrome (2535886885352).

The spelling of 1315343450221 in words is "one trillion, three hundred fifteen billion, three hundred forty-three million, four hundred fifty thousand, two hundred twenty-one".