11211311221 has 8 divisors (see below), whose sum is σ = 12367944000. Its totient is φ = 10077582240.

The previous prime is 11211311183. The next prime is 11211311257. The reversal of 11211311221 is 12211311211.

It is a happy number.

11211311221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11211311221 - 2²¹ = 11209214069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211311195 and 11211311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211311021) 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 in 7 ways as a sum of consecutive naturals, for example, 5724921 + ... + 5726878.

It is an arithmetic number, because the mean of its divisors is an integer number (1545993000).

Almost surely, 2^11211311221 is an apocalyptic number.

11211311221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211311221 is a deficient number, since it is larger than the sum of its proper divisors (1156632779).

11211311221 is a wasteful number, since it uses less digits than its factorization.

11211311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11451899.

The product of its digits is 24, while the sum is 16.

Adding to 11211311221 its reverse (12211311211), we get a palindrome (23422622432).

The spelling of 11211311221 in words is "eleven billion, two hundred eleven million, three hundred eleven thousand, two hundred twenty-one".