11323021221 has 24 divisors (see below), whose sum is σ = 16530706296. Its totient is φ = 7467926400.

The previous prime is 11323021211. The next prime is 11323021247. The reversal of 11323021221 is 12212032311.

It can be written as a sum of positive squares in 4 ways, for example, as 7050960900 + 4272060321 = 83970^2 + 65361^2 .

It is not a de Polignac number, because 11323021221 - 2⁵ = 11323021189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11323021194 and 11323021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11323021211) 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 23 ways as a sum of consecutive naturals, for example, 1316491 + ... + 1325063.

It is an arithmetic number, because the mean of its divisors is an integer number (688779429).

Almost surely, 2^11323021221 is an apocalyptic number.

It is an amenable number.

11323021221 is a deficient number, since it is larger than the sum of its proper divisors (5207685075).

11323021221 is a wasteful number, since it uses less digits than its factorization.

11323021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10133 (or 10130 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11323021221 its reverse (12212032311), we get a palindrome (23535053532).

The spelling of 11323021221 in words is "eleven billion, three hundred twenty-three million, twenty-one thousand, two hundred twenty-one".