21011101000111 has 4 divisors (see below), whose sum is σ = 21105321184192. Its totient is φ = 20916880816032.

The previous prime is 21011101000069. The next prime is 21011101000129. The reversal of 21011101000111 is 11100010111012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011101000111 - 2¹⁹ = 21011100475823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101003111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47110091706 + ... + 47110092151.

It is an arithmetic number, because the mean of its divisors is an integer number (5276330296048).

Almost surely, 2^{21011101000111} is an apocalyptic number.

21011101000111 is a deficient number, since it is larger than the sum of its proper divisors (94220184081).

21011101000111 is an equidigital number, since it uses as much as digits as its factorization.

21011101000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94220184080.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 21011101000111 its reverse (11100010111012), we get a palindrome (32111111111123).

The spelling of 21011101000111 in words is "twenty-one trillion, eleven billion, one hundred one million, one hundred eleven", and thus it is an aban number.