21111400411111 has 16 divisors (see below), whose sum is σ = 21369052710720. Its totient is φ = 20854931328000.

The previous prime is 21111400411091. The next prime is 21111400411117. The reversal of 21111400411111 is 11111400411112.

It is a cyclic number.

It is not a de Polignac number, because 21111400411111 - 2⁹ = 21111400410599 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 (21111400411117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244016361 + ... + 244102861.

It is an arithmetic number, because the mean of its divisors is an integer number (1335565794420).

Almost surely, 2^{21111400411111} is an apocalyptic number.

21111400411111 is a deficient number, since it is larger than the sum of its proper divisors (257652299609).

21111400411111 is a wasteful number, since it uses less digits than its factorization.

21111400411111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93306.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 21111400411111 its reverse (11111400411112), we get a palindrome (32222800822223).

Subtracting from 21111400411111 its reverse (11111400411112), we obtain a palindrome (9999999999999).

The spelling of 21111400411111 in words is "twenty-one trillion, one hundred eleven billion, four hundred million, four hundred eleven thousand, one hundred eleven".