11111003221 has 4 divisors (see below), whose sum is σ = 11129129452. Its totient is φ = 11092876992.

The previous prime is 11111003219. The next prime is 11111003243. The reversal of 11111003221 is 12230011111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12230011111 = 71671 ⋅170641.

It can be written as a sum of positive squares in 2 ways, for example, as 386122500 + 10724880721 = 19650^2 + 103561^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111003221 - 2¹ = 11111003219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111003621) 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, 9062196 + ... + 9063421.

It is an arithmetic number, because the mean of its divisors is an integer number (2782282363).

Almost surely, 2^11111003221 is an apocalyptic number.

It is an amenable number.

11111003221 is a deficient number, since it is larger than the sum of its proper divisors (18126231).

11111003221 is an equidigital number, since it uses as much as digits as its factorization.

11111003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18126230.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11111003221 its reverse (12230011111), we get a palindrome (23341014332).

The spelling of 11111003221 in words is "eleven billion, one hundred eleven million, three thousand, two hundred twenty-one".