21110111000001 has 80 divisors (see below), whose sum is σ = 33181272432000. Its totient is φ = 13356921295872.

The previous prime is 21110110999931. The next prime is 21110111000021. The reversal of 21110111000001 is 10000011101112.

It is not a de Polignac number, because 21110111000001 - 2¹¹ = 21110110997953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21110111000021) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 38526385 + ... + 39070481.

It is an arithmetic number, because the mean of its divisors is an integer number (414765905400).

Almost surely, 2^{21110111000001} is an apocalyptic number.

It is an amenable number.

21110111000001 is a deficient number, since it is larger than the sum of its proper divisors (12071161431999).

21110111000001 is a wasteful number, since it uses less digits than its factorization.

21110111000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544420 (or 544411 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21110111000001 its reverse (10000011101112), we get a palindrome (31110122101113).

The spelling of 21110111000001 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one", and thus it is an aban number.