21111100110211 has 8 divisors (see below), whose sum is σ = 21253075470000. Its totient is φ = 20969128619040.

The previous prime is 21111100110179. The next prime is 21111100110227. The reversal of 21111100110211 is 11201100111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21111100110211 - 2⁵ = 21111100110179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111100110191 and 21111100110200.

It is not an unprimeable number, because it can be changed into a prime (21111100110241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10433940 + ... + 12291838.

It is an arithmetic number, because the mean of its divisors is an integer number (2656634433750).

Almost surely, 2^{21111100110211} is an apocalyptic number.

21111100110211 is a deficient number, since it is larger than the sum of its proper divisors (141975359789).

21111100110211 is a wasteful number, since it uses less digits than its factorization.

21111100110211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934309.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21111100110211 its reverse (11201100111112), we get a palindrome (32312200221323).

Subtracting from 21111100110211 its reverse (11201100111112), we obtain a palindrome (9909999999099).

The spelling of 21111100110211 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, one hundred ten thousand, two hundred eleven".