11453423521 has 4 divisors (see below), whose sum is σ = 11455039044. Its totient is φ = 11451808000.

The previous prime is 11453423503. The next prime is 11453423563. The reversal of 11453423521 is 12532435411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4601722896 + 6851700625 = 67836^2 + 82775^2 .

It is a cyclic number.

It is not a de Polignac number, because 11453423521 - 2¹⁹ = 11452899233 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11453423591) 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 3 ways as a sum of consecutive naturals, for example, 797080 + ... + 811321.

It is an arithmetic number, because the mean of its divisors is an integer number (2863759761).

Almost surely, 2^11453423521 is an apocalyptic number.

It is an amenable number.

11453423521 is a deficient number, since it is larger than the sum of its proper divisors (1615523).

11453423521 is an equidigital number, since it uses as much as digits as its factorization.

11453423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615522.

The product of its digits is 14400, while the sum is 31.

Adding to 11453423521 its reverse (12532435411), we get a palindrome (23985858932).

The spelling of 11453423521 in words is "eleven billion, four hundred fifty-three million, four hundred twenty-three thousand, five hundred twenty-one".