11236111421 has 4 divisors (see below), whose sum is σ = 11237323644. Its totient is φ = 11234899200.

The previous prime is 11236111399. The next prime is 11236111441. The reversal of 11236111421 is 12411163211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12411163211 = 12653 ⋅980887.

It can be written as a sum of positive squares in 2 ways, for example, as 6891324196 + 4344787225 = 83014^2 + 65915^2 .

It is a cyclic number.

It is not a de Polignac number, because 11236111421 - 2¹⁸ = 11235849277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11236111441) 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, 592100 + ... + 610781.

It is an arithmetic number, because the mean of its divisors is an integer number (2809330911).

Almost surely, 2^11236111421 is an apocalyptic number.

It is an amenable number.

11236111421 is a deficient number, since it is larger than the sum of its proper divisors (1212223).

11236111421 is an equidigital number, since it uses as much as digits as its factorization.

11236111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212222.

The product of its digits is 288, while the sum is 23.

Adding to 11236111421 its reverse (12411163211), we get a palindrome (23647274632).

The spelling of 11236111421 in words is "eleven billion, two hundred thirty-six million, one hundred eleven thousand, four hundred twenty-one".