11221102112221 has 4 divisors (see below), whose sum is σ = 11221171178332. Its totient is φ = 11221033046112.

The previous prime is 11221102112149. The next prime is 11221102112251. The reversal of 11221102112221 is 12221120112211.

It is a happy number.

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 1893758547321 + 9327343564900 = 1376139^2 + 3054070^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221102112221 - 2¹¹ = 11221102110173 is a prime.

It is a super-2 number, since 2×11221102112221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221102112251) 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, 34288776 + ... + 34614481.

It is an arithmetic number, because the mean of its divisors is an integer number (2805292794583).

Almost surely, 2^{11221102112221} is an apocalyptic number.

It is an amenable number.

11221102112221 is a deficient number, since it is larger than the sum of its proper divisors (69066111).

11221102112221 is an equidigital number, since it uses as much as digits as its factorization.

11221102112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69066110.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11221102112221 its reverse (12221120112211), we get a palindrome (23442222224432).

The spelling of 11221102112221 in words is "eleven trillion, two hundred twenty-one billion, one hundred two million, one hundred twelve thousand, two hundred twenty-one".