11124423721 has 4 divisors (see below), whose sum is σ = 11130881872. Its totient is φ = 11117965572.

The previous prime is 11124423691. The next prime is 11124423727. The reversal of 11124423721 is 12732442111.

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 11124423721 - 2⁵ = 11124423689 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 11124423721.

It is not an unprimeable number, because it can be changed into a prime (11124423727) 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, 3226491 + ... + 3229936.

It is an arithmetic number, because the mean of its divisors is an integer number (2782720468).

Almost surely, 2^11124423721 is an apocalyptic number.

It is an amenable number.

11124423721 is a deficient number, since it is larger than the sum of its proper divisors (6458151).

11124423721 is an equidigital number, since it uses as much as digits as its factorization.

11124423721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6458150.

The product of its digits is 2688, while the sum is 28.

Adding to 11124423721 its reverse (12732442111), we get a palindrome (23856865832).

The spelling of 11124423721 in words is "eleven billion, one hundred twenty-four million, four hundred twenty-three thousand, seven hundred twenty-one".