21110220220111 has 16 divisors (see below), whose sum is σ = 23427282682368. Its totient is φ = 18860812185600.

The previous prime is 21110220220097. The next prime is 21110220220129. The reversal of 21110220220111 is 11102202201112.

It is not a de Polignac number, because 21110220220111 - 2¹⁷ = 21110220089039 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 (21110220290111) 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, 32911410 + ... + 33546703.

It is an arithmetic number, because the mean of its divisors is an integer number (1464205167648).

Almost surely, 2^{21110220220111} is an apocalyptic number.

21110220220111 is a deficient number, since it is larger than the sum of its proper divisors (2317062462257).

21110220220111 is a wasteful number, since it uses less digits than its factorization.

21110220220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66458622.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110220220111 its reverse (11102202201112), we get a palindrome (32212422421223).

It can be divided in two parts, 2 and 1110220220111, that multiplied together give a palindrome (2220440440222).

The spelling of 21110220220111 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty million, two hundred twenty thousand, one hundred eleven".