11111102102221 has 6 divisors (see below), whose sum is σ = 12213029583566. Its totient is φ = 10101001911000.

The previous prime is 11111102102213. The next prime is 11111102102257. The reversal of 11111102102221 is 12220120111111.

It can be written as a sum of positive squares in only one way, i.e., 8626033614121 + 2485068488100 = 2937011^2 + 1576410^2 .

It is not a de Polignac number, because 11111102102221 - 2³ = 11111102102213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111102102195 and 11111102102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111102102621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45913644930 + ... + 45913645171.

Almost surely, 2^{11111102102221} is an apocalyptic number.

11111102102221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111102102221 is a deficient number, since it is larger than the sum of its proper divisors (1101927481345).

11111102102221 is an equidigital number, since it uses as much as digits as its factorization.

11111102102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91827290123 (or 91827290112 counting only the distinct ones).

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

Adding to 11111102102221 its reverse (12220120111111), we get a palindrome (23331222213332).

The spelling of 11111102102221 in words is "eleven trillion, one hundred eleven billion, one hundred two million, one hundred two thousand, two hundred twenty-one".