11221213211221 has 12 divisors (see below), whose sum is σ = 12153233313732. Its totient is φ = 10355952612096.

The previous prime is 11221213211147. The next prime is 11221213211231. The reversal of 11221213211221 is 12211231212211.

It can be written as a sum of positive squares in 6 ways, for example, as 915636558321 + 10305576652900 = 956889^2 + 3210230^2 .

It is not a de Polignac number, because 11221213211221 - 2⁹ = 11221213210709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221213211192 and 11221213211201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221213211231) 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, 5859636 + ... + 7535101.

It is an arithmetic number, because the mean of its divisors is an integer number (1012769442811).

Almost surely, 2^{11221213211221} is an apocalyptic number.

It is an amenable number.

11221213211221 is a deficient number, since it is larger than the sum of its proper divisors (932020102511).

11221213211221 is a wasteful number, since it uses less digits than its factorization.

11221213211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13399720 (or 13399707 counting only the distinct ones).

The product of its digits is 192, while the sum is 22.

Adding to 11221213211221 its reverse (12211231212211), we get a palindrome (23432444423432).

The spelling of 11221213211221 in words is "eleven trillion, two hundred twenty-one billion, two hundred thirteen million, two hundred eleven thousand, two hundred twenty-one".