11521423 has 4 divisors (see below), whose sum is σ = 11528680. Its totient is φ = 11514168.

The previous prime is 11521421. The next prime is 11521453. The reversal of 11521423 is 32412511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32412511 = 73 ⋅444007.

It is a cyclic number.

It is not a de Polignac number, because 11521423 - 2¹ = 11521421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11521423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521421) 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, 108 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (2882170).

Almost surely, 2^11521423 is an apocalyptic number.

11521423 is a deficient number, since it is larger than the sum of its proper divisors (7257).

11521423 is an equidigital number, since it uses as much as digits as its factorization.

11521423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7256.

The product of its digits is 240, while the sum is 19.

The square root of 11521423 is about 3394.3221709201. The cubic root of 11521423 is about 225.8579458143.

Adding to 11521423 its reverse (32412511), we get a palindrome (43933934).

The spelling of 11521423 in words is "eleven million, five hundred twenty-one thousand, four hundred twenty-three".