21100020001111 has 4 divisors (see below), whose sum is σ = 21126037289224. Its totient is φ = 21074002713000.

The previous prime is 21100020001009. The next prime is 21100020001169. The reversal of 21100020001111 is 11110002000112.

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 21100020001111 - 2¹¹ = 21100019999063 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 (21100020001211) 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 3 ways as a sum of consecutive naturals, for example, 13008642840 + ... + 13008644461.

It is an arithmetic number, because the mean of its divisors is an integer number (5281509322306).

Almost surely, 2^{21100020001111} is an apocalyptic number.

21100020001111 is a deficient number, since it is larger than the sum of its proper divisors (26017288113).

21100020001111 is an equidigital number, since it uses as much as digits as its factorization.

21100020001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26017288112.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21100020001111 its reverse (11110002000112), we get a palindrome (32210022001223).

It can be divided in two parts, 2110002000111 and 1, that added together give a palindrome (2110002000112).

The spelling of 21100020001111 in words is "twenty-one trillion, one hundred billion, twenty million, one thousand, one hundred eleven".