1321503545525 has 12 divisors (see below), whose sum is σ = 1646982495972. Its totient is φ = 1051836320640.

The previous prime is 1321503545519. The next prime is 1321503545567. The reversal of 1321503545525 is 5255453051231.

It can be written as a sum of positive squares in 6 ways, for example, as 6266147281 + 1315237398244 = 79159^2 + 1146838^2 .

It is not a de Polignac number, because 1321503545525 - 2⁸ = 1321503545269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134157872 + ... + 134167721.

It is an arithmetic number, because the mean of its divisors is an integer number (137248541331).

Almost surely, 2^{1321503545525} is an apocalyptic number.

It is an amenable number.

1321503545525 is a deficient number, since it is larger than the sum of its proper divisors (325478950447).

1321503545525 is a wasteful number, since it uses less digits than its factorization.

1321503545525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268325800 (or 268325795 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 41.

Adding to 1321503545525 its reverse (5255453051231), we get a palindrome (6576956596756).

The spelling of 1321503545525 in words is "one trillion, three hundred twenty-one billion, five hundred three million, five hundred forty-five thousand, five hundred twenty-five".