11221010111221 has 4 divisors (see below), whose sum is σ = 11374722578572. Its totient is φ = 11067297643872.

The previous prime is 11221010111209. The next prime is 11221010111293. The reversal of 11221010111221 is 12211101012211.

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 2961789370225 + 8259220740996 = 1720985^2 + 2873886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221010111221 - 2¹¹ = 11221010109173 is a prime.

It is a super-2 number, since 2×11221010111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221010111195 and 11221010111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221011111221) 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, 76856233566 + ... + 76856233711.

It is an arithmetic number, because the mean of its divisors is an integer number (2843680644643).

Almost surely, 2^{11221010111221} is an apocalyptic number.

It is an amenable number.

11221010111221 is a deficient number, since it is larger than the sum of its proper divisors (153712467351).

11221010111221 is an equidigital number, since it uses as much as digits as its factorization.

11221010111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153712467350.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 11221010111221 its reverse (12211101012211), we get a palindrome (23432111123432).

The spelling of 11221010111221 in words is "eleven trillion, two hundred twenty-one billion, ten million, one hundred eleven thousand, two hundred twenty-one".