1313563450021 has 2 divisors, whose sum is σ = 1313563450022. Its totient is φ = 1313563450020.

The previous prime is 1313563449973. The next prime is 1313563450181. The reversal of 1313563450021 is 1200543653131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1256842788100 + 56720661921 = 1121090^2 + 238161^2 .

It is an emirp because it is prime and its reverse (1200543653131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1313563450021 - 2²¹ = 1313561352869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313563460021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656781725010 + 656781725011.

It is an arithmetic number, because the mean of its divisors is an integer number (656781725011).

Almost surely, 2^{1313563450021} is an apocalyptic number.

It is an amenable number.

1313563450021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313563450021 is an equidigital number, since it uses as much as digits as its factorization.

1313563450021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

It can be divided in two parts, 1313563 and 450021, that added together give a square (1763584 = 1328²).

The spelling of 1313563450021 in words is "one trillion, three hundred thirteen billion, five hundred sixty-three million, four hundred fifty thousand, twenty-one".