21220110202211 has 4 divisors (see below), whose sum is σ = 21227680704552. Its totient is φ = 21212539699872.

The previous prime is 21220110202199. The next prime is 21220110202223. The reversal of 21220110202211 is 11220201102212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21220110202199) and next prime (21220110202223).

It is a cyclic number.

It is not a de Polignac number, because 21220110202211 - 2²² = 21220106007907 is a prime.

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 21220110202211.

It is not an unprimeable number, because it can be changed into a prime (21220110202231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3785246966 + ... + 3785252571.

It is an arithmetic number, because the mean of its divisors is an integer number (5306920176138).

Almost surely, 2^{21220110202211} is an apocalyptic number.

21220110202211 is a deficient number, since it is larger than the sum of its proper divisors (7570502341).

21220110202211 is an equidigital number, since it uses as much as digits as its factorization.

21220110202211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7570502340.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220110202211 its reverse (11220201102212), we get a palindrome (32440311304423).

Subtracting from 21220110202211 its reverse (11220201102212), we obtain a palindrome (9999909099999).

The spelling of 21220110202211 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, two hundred two thousand, two hundred eleven".