1316565501021 has 16 divisors (see below), whose sum is σ = 1950502377600. Its totient is φ = 877694598144.

The previous prime is 1316565500989. The next prime is 1316565501037. The reversal of 1316565501021 is 1201055656131.

1316565501021 is a `hidden beast` number, since 1 + 3 + 16 + 565 + 50 + 10 + 21 = 666.

It is not a de Polignac number, because 1316565501021 - 2⁵ = 1316565500989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316565541021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1209565 + ... + 2023901.

It is an arithmetic number, because the mean of its divisors is an integer number (121906398600).

Almost surely, 2^{1316565501021} is an apocalyptic number.

It is an amenable number.

1316565501021 is a deficient number, since it is larger than the sum of its proper divisors (633936876579).

1316565501021 is an equidigital number, since it uses as much as digits as its factorization.

1316565501021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874225 (or 874219 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 1316565501021 in words is "one trillion, three hundred sixteen billion, five hundred sixty-five million, five hundred one thousand, twenty-one".