21120211212111 has 32 divisors (see below), whose sum is σ = 34133974775040. Its totient is φ = 12800015474400.

The previous prime is 21120211212109. The next prime is 21120211212131. The reversal of 21120211212111 is 11121211202112.

It is a happy number.

21120211212111 is a `hidden beast` number, since 211 + 20 + 211 + 212 + 1 + 11 = 666.

It is not a de Polignac number, because 21120211212111 - 2¹ = 21120211212109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44160981 + ... + 44636673.

It is an arithmetic number, because the mean of its divisors is an integer number (1066686711720).

Almost surely, 2^{21120211212111} is an apocalyptic number.

21120211212111 is a deficient number, since it is larger than the sum of its proper divisors (13013763562929).

21120211212111 is a wasteful number, since it uses less digits than its factorization.

21120211212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625204 (or 625198 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21120211212111 its reverse (11121211202112), we get a palindrome (32241422414223).

Subtracting from 21120211212111 its reverse (11121211202112), we obtain a palindrome (9999000009999).

The spelling of 21120211212111 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".