1321301321523 has 12 divisors (see below), whose sum is σ = 2008996161640. Its totient is φ = 834506097696.

The previous prime is 1321301321521. The next prime is 1321301321569. The reversal of 1321301321523 is 3251231031231.

1321301321523 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 3 + 0 + 132 + 1 + 523 = 666.

It is not a de Polignac number, because 1321301321523 - 2¹ = 1321301321521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321301321521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3863453986 + ... + 3863454327.

Almost surely, 2^{1321301321523} is an apocalyptic number.

1321301321523 is a deficient number, since it is larger than the sum of its proper divisors (687694840117).

1321301321523 is a wasteful number, since it uses less digits than its factorization.

1321301321523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7726908338 (or 7726908335 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 1321301321523 its reverse (3251231031231), we get a palindrome (4572532352754).

The spelling of 1321301321523 in words is "one trillion, three hundred twenty-one billion, three hundred one million, three hundred twenty-one thousand, five hundred twenty-three".