21110211100221 has 32 divisors (see below), whose sum is σ = 29640146400000. Its totient is φ = 13338542519808.

The previous prime is 21110211100219. The next prime is 21110211100241. The reversal of 21110211100221 is 12200111201112.

It is a happy number.

It is not a de Polignac number, because 21110211100221 - 2¹ = 21110211100219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110211100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110211100241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1694755 + ... + 6715103.

It is an arithmetic number, because the mean of its divisors is an integer number (926254575000).

Almost surely, 2^{21110211100221} is an apocalyptic number.

It is an amenable number.

21110211100221 is a deficient number, since it is larger than the sum of its proper divisors (8529935299779).

21110211100221 is a wasteful number, since it uses less digits than its factorization.

21110211100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020933.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110211100221 its reverse (12200111201112), we get a palindrome (33310322301333).

The spelling of 21110211100221 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".