21202110220111 has 24 divisors (see below), whose sum is σ = 21501429427296. Its totient is φ = 20906002948800.

The previous prime is 21202110220073. The next prime is 21202110220139. The reversal of 21202110220111 is 11102201120212.

It is not a de Polignac number, because 21202110220111 - 2²⁹ = 21201573349199 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 (21202110220141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3356354325 + ... + 3356360641.

It is an arithmetic number, because the mean of its divisors is an integer number (895892892804).

Almost surely, 2^{21202110220111} is an apocalyptic number.

21202110220111 is a deficient number, since it is larger than the sum of its proper divisors (299319207185).

21202110220111 is an equidigital number, since it uses as much as digits as its factorization.

21202110220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7599 (or 7432 counting only the distinct ones).

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

Adding to 21202110220111 its reverse (11102201120212), we get a palindrome (32304311340323).

The spelling of 21202110220111 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, two hundred twenty thousand, one hundred eleven".