111111110110021 has 8 divisors (see below), whose sum is σ = 129065832821504. Its totient is φ = 93676814143920.

The previous prime is 111111110110003. The next prime is 111111110110043. The reversal of 111111110110021 is 120011011111111.

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

It is not a de Polignac number, because 111111110110021 - 2¹³ = 111111110101829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111110109983 and 111111110110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111110110051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130106685885 + ... + 130106686738.

It is an arithmetic number, because the mean of its divisors is an integer number (16133229102688).

Almost surely, 2^{111111110110021} is an apocalyptic number.

It is an amenable number.

111111110110021 is a deficient number, since it is larger than the sum of its proper divisors (17954722711483).

111111110110021 is an equidigital number, since it uses as much as digits as its factorization.

111111110110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260213372691.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 111111110110021 its reverse (120011011111111), we get a palindrome (231122121221132).

The spelling of 111111110110021 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred ten million, one hundred ten thousand, twenty-one".