11553041221 has 2 divisors, whose sum is σ = 11553041222. Its totient is φ = 11553041220.

The previous prime is 11553041207. The next prime is 11553041263. The reversal of 11553041221 is 12214035511.

11553041221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6334568100 + 5218473121 = 79590^2 + 72239^2 .

It is an emirp because it is prime and its reverse (12214035511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11553041221 - 2²⁵ = 11519486789 is a prime.

It is a super-2 number, since 2×11553041221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11553041821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5776520610 + 5776520611.

It is an arithmetic number, because the mean of its divisors is an integer number (5776520611).

Almost surely, 2^11553041221 is an apocalyptic number.

It is an amenable number.

11553041221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11553041221 is an equidigital number, since it uses as much as digits as its factorization.

11553041221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 11553041221 its reverse (12214035511), we get a palindrome (23767076732).

The spelling of 11553041221 in words is "eleven billion, five hundred fifty-three million, forty-one thousand, two hundred twenty-one".