11521075621403 has 4 divisors (see below), whose sum is σ = 11544732861360. Its totient is φ = 11497418381448.

The previous prime is 11521075621309. The next prime is 11521075621439. The reversal of 11521075621403 is 30412657012511.

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

It is a cyclic number.

It is not a de Polignac number, because 11521075621403 - 2¹⁶ = 11521075555867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11521075641403) 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, 11828619248 + ... + 11828620221.

It is an arithmetic number, because the mean of its divisors is an integer number (2886183215340).

Almost surely, 2^{11521075621403} is an apocalyptic number.

11521075621403 is a deficient number, since it is larger than the sum of its proper divisors (23657239957).

11521075621403 is an equidigital number, since it uses as much as digits as its factorization.

11521075621403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23657239956.

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 11521075621403 its sum of digits (38), we get a square (11521075621441 = 3394271²).

The spelling of 11521075621403 in words is "eleven trillion, five hundred twenty-one billion, seventy-five million, six hundred twenty-one thousand, four hundred three".