11110221101221 has 12 divisors (see below), whose sum is σ = 12332972721132. Its totient is φ = 10000199000000.

The previous prime is 11110221101197. The next prime is 11110221101261. The reversal of 11110221101221 is 12210112201111.

It can be written as a sum of positive squares in 2 ways, for example, as 9268462692225 + 1841758408996 = 3044415^2 + 1357114^2 .

It is not a de Polignac number, because 11110221101221 - 2³¹ = 11108073617573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11110221101195 and 11110221101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11110221101261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454542280 + ... + 454566721.

It is an arithmetic number, because the mean of its divisors is an integer number (1027747726761).

Almost surely, 2^{11110221101221} is an apocalyptic number.

11110221101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11110221101221 is a deficient number, since it is larger than the sum of its proper divisors (1222751619911).

11110221101221 is a wasteful number, since it uses less digits than its factorization.

11110221101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909109124 (or 909109113 counting only the distinct ones).

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

Adding to 11110221101221 its reverse (12210112201111), we get a palindrome (23320333302332).

The spelling of 11110221101221 in words is "eleven trillion, one hundred ten billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-one".