11565413421 has 4 divisors (see below), whose sum is σ = 15420551232. Its totient is φ = 7710275612.

The previous prime is 11565413393. The next prime is 11565413467. The reversal of 11565413421 is 12431456511.

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 11565413421 - 2¹⁴ = 11565397037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11565413471) 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, 1927568901 + ... + 1927568906.

It is an arithmetic number, because the mean of its divisors is an integer number (3855137808).

Almost surely, 2^11565413421 is an apocalyptic number.

It is an amenable number.

11565413421 is a deficient number, since it is larger than the sum of its proper divisors (3855137811).

11565413421 is an equidigital number, since it uses as much as digits as its factorization.

11565413421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855137810.

The product of its digits is 14400, while the sum is 33.

Adding to 11565413421 its reverse (12431456511), we get a palindrome (23996869932).

The spelling of 11565413421 in words is "eleven billion, five hundred sixty-five million, four hundred thirteen thousand, four hundred twenty-one".