11112111021 has 8 divisors (see below), whose sum is σ = 16163070624. Its totient is φ = 6734612720.

The previous prime is 11112111011. The next prime is 11112111061. The reversal of 11112111021 is 12011121111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11112111021 - 2¹⁰ = 11112109997 is a prime.

It is a super-2 number, since 2×11112111021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11112110988 and 11112111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168365286 + ... + 168365351.

It is an arithmetic number, because the mean of its divisors is an integer number (2020383828).

Almost surely, 2^11112111021 is an apocalyptic number.

11112111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11112111021 is a deficient number, since it is larger than the sum of its proper divisors (5050959603).

11112111021 is a wasteful number, since it uses less digits than its factorization.

11112111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336730651.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11112111021 its reverse (12011121111), we get a palindrome (23123232132).

The spelling of 11112111021 in words is "eleven billion, one hundred twelve million, one hundred eleven thousand, twenty-one".