21202110111211 has 16 divisors (see below), whose sum is σ = 22406082652800. Its totient is φ = 20006953371648.

The previous prime is 21202110111179. The next prime is 21202110111229. The reversal of 21202110111211 is 11211101120212.

It is a cyclic number.

It is not a de Polignac number, because 21202110111211 - 2⁵ = 21202110111179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202110111241) 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 15 ways as a sum of consecutive naturals, for example, 96783960 + ... + 97002778.

It is an arithmetic number, because the mean of its divisors is an integer number (1400380165800).

Almost surely, 2^{21202110111211} is an apocalyptic number.

21202110111211 is a deficient number, since it is larger than the sum of its proper divisors (1203972541589).

21202110111211 is a wasteful number, since it uses less digits than its factorization.

21202110111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238938.

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

Adding to 21202110111211 its reverse (11211101120212), we get a palindrome (32413211231423).

The spelling of 21202110111211 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, one hundred eleven thousand, two hundred eleven".