211110211002221 has 12 divisors (see below), whose sum is σ = 235912306842972. Its totient is φ = 188234491538304.

The previous prime is 211110211002203. The next prime is 211110211002311. The reversal of 211110211002221 is 122200112011112.

It can be written as a sum of positive squares in 2 ways, for example, as 84393876784996 + 126716334217225 = 9186614^2 + 11256835^2 .

It is not a de Polignac number, because 211110211002221 - 2²² = 211110206807917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211110211002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110211062221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17199782930 + ... + 17199795203.

It is an arithmetic number, because the mean of its divisors is an integer number (19659358903581).

Almost surely, 2^{211110211002221} is an apocalyptic number.

It is an amenable number.

211110211002221 is a deficient number, since it is larger than the sum of its proper divisors (24802095840751).

211110211002221 is a wasteful number, since it uses less digits than its factorization.

211110211002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34399578188 (or 34399578169 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211110211002221 its reverse (122200112011112), we get a palindrome (333310323013333).

The spelling of 211110211002221 in words is "two hundred eleven trillion, one hundred ten billion, two hundred eleven million, two thousand, two hundred twenty-one".