11534423201221 has 16 divisors (see below), whose sum is σ = 11754406323504. Its totient is φ = 11316213264384.

The previous prime is 11534423201209. The next prime is 11534423201239. The reversal of 11534423201221 is 12210232443511.

11534423201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 21058072996 + 11513365128225 = 145114^2 + 3393135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11534423201221 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 (11534423201201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16617885 + ... + 17298061.

It is an arithmetic number, because the mean of its divisors is an integer number (734650395219).

Almost surely, 2^{11534423201221} is an apocalyptic number.

It is an amenable number.

11534423201221 is a deficient number, since it is larger than the sum of its proper divisors (219983122283).

11534423201221 is an equidigital number, since it uses as much as digits as its factorization.

11534423201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681480.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 11534423201221 its reverse (12210232443511), we get a palindrome (23744655644732).

The spelling of 11534423201221 in words is "eleven trillion, five hundred thirty-four billion, four hundred twenty-three million, two hundred one thousand, two hundred twenty-one".