21122011201111 has 4 divisors (see below), whose sum is σ = 21125408667712. Its totient is φ = 21118613734512.

The previous prime is 21122011201097. The next prime is 21122011201129. The reversal of 21122011201111 is 11110211022112.

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 21122011201111 - 2⁹ = 21122011200599 is a prime.

It is a super-2 number, since 2×21122011201111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122011201141) 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 3 ways as a sum of consecutive naturals, for example, 1698723975 + ... + 1698736408.

It is an arithmetic number, because the mean of its divisors is an integer number (5281352166928).

Almost surely, 2^{21122011201111} is an apocalyptic number.

21122011201111 is a deficient number, since it is larger than the sum of its proper divisors (3397466601).

21122011201111 is an equidigital number, since it uses as much as digits as its factorization.

21122011201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397466600.

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

Adding to 21122011201111 its reverse (11110211022112), we get a palindrome (32232222223223).

The spelling of 21122011201111 in words is "twenty-one trillion, one hundred twenty-two billion, eleven million, two hundred one thousand, one hundred eleven".