21210120220211 has 16 divisors (see below), whose sum is σ = 23465827207200. Its totient is φ = 19046315393280.

The previous prime is 21210120220193. The next prime is 21210120220279. The reversal of 21210120220211 is 11202202101212.

It is a cyclic number.

It is not a de Polignac number, because 21210120220211 - 2⁶ = 21210120220147 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 21210120220211.

It is not an unprimeable number, because it can be changed into a prime (21210120225211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56825225 + ... + 57197258.

It is an arithmetic number, because the mean of its divisors is an integer number (1466614200450).

Almost surely, 2^{21210120220211} is an apocalyptic number.

21210120220211 is a deficient number, since it is larger than the sum of its proper divisors (2255706986989).

21210120220211 is a wasteful number, since it uses less digits than its factorization.

21210120220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114022886.

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

Adding to 21210120220211 its reverse (11202202101212), we get a palindrome (32412322321423).

The spelling of 21210120220211 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, two hundred twenty thousand, two hundred eleven".