11111012221221 has 12 divisors (see below), whose sum is σ = 17508261682080. Its totient is φ = 6733946800680.

The previous prime is 11111012221207. The next prime is 11111012221241. The reversal of 11111012221221 is 12212221011111.

It is a happy number.

11111012221221 is a `hidden beast` number, since 111 + 110 + 1 + 2 + 221 + 221 = 666.

It is not a de Polignac number, because 11111012221221 - 2⁵ = 11111012221189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111012221194 and 11111012221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111012221241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56116223241 + ... + 56116223438.

It is an arithmetic number, because the mean of its divisors is an integer number (1459021806840).

Almost surely, 2^{11111012221221} is an apocalyptic number.

11111012221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111012221221 is a deficient number, since it is larger than the sum of its proper divisors (6397249460859).

11111012221221 is a wasteful number, since it uses less digits than its factorization.

11111012221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112232446696 (or 112232446693 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11111012221221 its reverse (12212221011111), we get a palindrome (23323233232332).

The spelling of 11111012221221 in words is "eleven trillion, one hundred eleven billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".