11553845221 has 4 divisors (see below), whose sum is σ = 11562880000. Its totient is φ = 11544810444.

The previous prime is 11553845213. The next prime is 11553845243. The reversal of 11553845221 is 12254835511.

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: 12254835511 = 107 ⋅114531173.

It is a cyclic number.

It is not a de Polignac number, because 11553845221 - 2³ = 11553845213 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 (11553845321) 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 3 ways as a sum of consecutive naturals, for example, 4515471 + ... + 4518028.

It is an arithmetic number, because the mean of its divisors is an integer number (2890720000).

Almost surely, 2^11553845221 is an apocalyptic number.

It is an amenable number.

11553845221 is a deficient number, since it is larger than the sum of its proper divisors (9034779).

11553845221 is an equidigital number, since it uses as much as digits as its factorization.

11553845221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034778.

The product of its digits is 48000, while the sum is 37.

The spelling of 11553845221 in words is "eleven billion, five hundred fifty-three million, eight hundred forty-five thousand, two hundred twenty-one".