21100213201111 has 16 divisors (see below), whose sum is σ = 23828609571840. Its totient is φ = 18507763622880.

The previous prime is 21100213201099. The next prime is 21100213201121. The reversal of 21100213201111 is 11110231200112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21100213201111 - 2¹⁷ = 21100213070039 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 (21100213201121) 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 15 ways as a sum of consecutive naturals, for example, 22394271 + ... + 23317456.

It is an arithmetic number, because the mean of its divisors is an integer number (1489288098240).

Almost surely, 2^{21100213201111} is an apocalyptic number.

21100213201111 is a deficient number, since it is larger than the sum of its proper divisors (2728396370729).

21100213201111 is a wasteful number, since it uses less digits than its factorization.

21100213201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45713214.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21100213201111 its reverse (11110231200112), we get a palindrome (32210444401223).

The spelling of 21100213201111 in words is "twenty-one trillion, one hundred billion, two hundred thirteen million, two hundred one thousand, one hundred eleven".