11111002221 has 16 divisors (see below), whose sum is σ = 16209430848. Its totient is φ = 6713952000.

The previous prime is 11111002213. The next prime is 11111002271. The reversal of 11111002221 is 12220011111.

It is not a de Polignac number, because 11111002221 - 2³ = 11111002213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111002197 and 11111002206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111002271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488430 + ... + 510671.

It is an arithmetic number, because the mean of its divisors is an integer number (1013089428).

Almost surely, 2^11111002221 is an apocalyptic number.

11111002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111002221 is a deficient number, since it is larger than the sum of its proper divisors (5098428627).

11111002221 is a wasteful number, since it uses less digits than its factorization.

11111002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999452.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11111002221 its reverse (12220011111), we get a palindrome (23331013332).

The spelling of 11111002221 in words is "eleven billion, one hundred eleven million, two thousand, two hundred twenty-one".