11112221021 has 16 divisors (see below), whose sum is σ = 12424708800. Its totient is φ = 9850377600.

The previous prime is 11112220993. The next prime is 11112221039. The reversal of 11112221021 is 12012221111.

11112221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11112221021 - 2²⁶ = 11045112157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112220987 and 11112221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112221621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1017890 + ... + 1028748.

It is an arithmetic number, because the mean of its divisors is an integer number (776544300).

Almost surely, 2^11112221021 is an apocalyptic number.

11112221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11112221021 is a deficient number, since it is larger than the sum of its proper divisors (1312487779).

11112221021 is a wasteful number, since it uses less digits than its factorization.

11112221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13180.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11112221021 its reverse (12012221111), we get a palindrome (23124442132).

The spelling of 11112221021 in words is "eleven billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".