11355340221 has 12 divisors (see below), whose sum is σ = 16409089372. Its totient is φ = 7567027776.

The previous prime is 11355340193. The next prime is 11355340229. The reversal of 11355340221 is 12204355311.

It can be written as a sum of positive squares in 2 ways, for example, as 8461976121 + 2893364100 = 91989^2 + 53790^2 .

It is not a de Polignac number, because 11355340221 - 2⁷ = 11355340093 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 (11355340229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244006 + ... + 286791.

Almost surely, 2^11355340221 is an apocalyptic number.

It is an amenable number.

11355340221 is a deficient number, since it is larger than the sum of its proper divisors (5053749151).

11355340221 is a wasteful number, since it uses less digits than its factorization.

11355340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533180 (or 533177 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 11355340221 its reverse (12204355311), we get a palindrome (23559695532).

The spelling of 11355340221 in words is "eleven billion, three hundred fifty-five million, three hundred forty thousand, two hundred twenty-one".