1358009017821 has 12 divisors (see below), whose sum is σ = 1998579309948. Its totient is φ = 888257470464.

The previous prime is 1358009017777. The next prime is 1358009017829. The reversal of 1358009017821 is 1287109008531.

It can be written as a sum of positive squares in 2 ways, for example, as 1245389040900 + 112619976921 = 1115970^2 + 335589^2 .

It is not a de Polignac number, because 1358009017821 - 2¹⁹ = 1358008493533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358009017829) 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 in 11 ways as a sum of consecutive naturals, for example, 1423489060 + ... + 1423490013.

It is an arithmetic number, because the mean of its divisors is an integer number (166548275829).

Almost surely, 2^{1358009017821} is an apocalyptic number.

It is an amenable number.

1358009017821 is a deficient number, since it is larger than the sum of its proper divisors (640570292127).

1358009017821 is a wasteful number, since it uses less digits than its factorization.

1358009017821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846979132 (or 2846979129 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 1358009017821 in words is "one trillion, three hundred fifty-eight billion, nine million, seventeen thousand, eight hundred twenty-one".