11523023421 has 16 divisors (see below), whose sum is σ = 18909577344. Its totient is φ = 6078078144.

The previous prime is 11523023401. The next prime is 11523023429. The reversal of 11523023421 is 12432032511.

It is not a de Polignac number, because 11523023421 - 2⁵ = 11523023389 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11523023391 and 11523023400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11523023429) 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 15 ways as a sum of consecutive naturals, for example, 21104166 + ... + 21104711.

It is an arithmetic number, because the mean of its divisors is an integer number (1181848584).

Almost surely, 2^11523023421 is an apocalyptic number.

It is an amenable number.

11523023421 is a deficient number, since it is larger than the sum of its proper divisors (7386553923).

11523023421 is a wasteful number, since it uses less digits than its factorization.

11523023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42208900.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 11523023421 its reverse (12432032511), we get a palindrome (23955055932).

The spelling of 11523023421 in words is "eleven billion, five hundred twenty-three million, twenty-three thousand, four hundred twenty-one".