111010000021 has 4 divisors (see below), whose sum is σ = 111013706412. Its totient is φ = 111006293632.

The previous prime is 111010000009. The next prime is 111010000067. The reversal of 111010000021 is 120000010111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120000010111 = 73037 ⋅1643003.

It can be written as a sum of positive squares in 2 ways, for example, as 76404699396 + 34605300625 = 276414^2 + 186025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111010000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111009999959 and 111010000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010000121) 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 3 ways as a sum of consecutive naturals, for example, 1807900 + ... + 1868293.

It is an arithmetic number, because the mean of its divisors is an integer number (27753426603).

Almost surely, 2^111010000021 is an apocalyptic number.

It is an amenable number.

111010000021 is a deficient number, since it is larger than the sum of its proper divisors (3706391).

111010000021 is an equidigital number, since it uses as much as digits as its factorization.

111010000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706390.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 111010000021 its reverse (120000010111), we get a palindrome (231010010132).

The spelling of 111010000021 in words is "one hundred eleven billion, ten million, twenty-one", and thus it is an aban number.