11321221323221 has 4 divisors (see below), whose sum is σ = 11325960221100. Its totient is φ = 11316482425344.

The previous prime is 11321221323199. The next prime is 11321221323229. The reversal of 11321221323221 is 12232312212311.

11321221323221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 750666288100 + 10570555035121 = 866410^2 + 3251239^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321221323221 - 2¹⁸ = 11321221061077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321221323229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2369445356 + ... + 2369450133.

It is an arithmetic number, because the mean of its divisors is an integer number (2831490055275).

Almost surely, 2^{11321221323221} is an apocalyptic number.

It is an amenable number.

11321221323221 is a deficient number, since it is larger than the sum of its proper divisors (4738897879).

11321221323221 is an equidigital number, since it uses as much as digits as its factorization.

11321221323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738897878.

The product of its digits is 1728, while the sum is 26.

Adding to 11321221323221 its reverse (12232312212311), we get a palindrome (23553533535532).

The spelling of 11321221323221 in words is "eleven trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".