13445520012321 has 4 divisors (see below), whose sum is σ = 17927360016432. Its totient is φ = 8963680008212.

The previous prime is 13445520012319. The next prime is 13445520012373. The reversal of 13445520012321 is 12321002554431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13445520012321 - 2¹ = 13445520012319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13445520012721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240920002051 + ... + 2240920002056.

It is an arithmetic number, because the mean of its divisors is an integer number (4481840004108).

Almost surely, 2^{13445520012321} is an apocalyptic number.

It is an amenable number.

13445520012321 is a deficient number, since it is larger than the sum of its proper divisors (4481840004111).

13445520012321 is an equidigital number, since it uses as much as digits as its factorization.

13445520012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481840004110.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 13445520012321 its reverse (12321002554431), we get a palindrome (25766522566752).

The spelling of 13445520012321 in words is "thirteen trillion, four hundred forty-five billion, five hundred twenty million, twelve thousand, three hundred twenty-one".