11553134221 has 4 divisors (see below), whose sum is σ = 11597062752. Its totient is φ = 11509205692.

The previous prime is 11553134189. The next prime is 11553134237. The reversal of 11553134221 is 12243135511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12243135511 = 941 ⋅13010771.

It is a cyclic number.

It is not a de Polignac number, because 11553134221 - 2⁵ = 11553134189 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 11553134221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11553134291) 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, 21963871 + ... + 21964396.

It is an arithmetic number, because the mean of its divisors is an integer number (2899265688).

Almost surely, 2^11553134221 is an apocalyptic number.

It is an amenable number.

11553134221 is a deficient number, since it is larger than the sum of its proper divisors (43928531).

11553134221 is an equidigital number, since it uses as much as digits as its factorization.

11553134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43928530.

The product of its digits is 3600, while the sum is 28.

Adding to 11553134221 its reverse (12243135511), we get a palindrome (23796269732).

The spelling of 11553134221 in words is "eleven billion, five hundred fifty-three million, one hundred thirty-four thousand, two hundred twenty-one".