21201212210211 has 12 divisors (see below), whose sum is σ = 33407970755640. Its totient is φ = 12849219521280.

The previous prime is 21201212210201. The next prime is 21201212210249. The reversal of 21201212210211 is 11201221210212.

21201212210211 is a `hidden beast` number, since 2 + 120 + 121 + 2 + 210 + 211 = 666.

It is not a de Polignac number, because 21201212210211 - 2⁹ = 21201212209699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201212210201) 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, 107076829246 + ... + 107076829443.

It is an arithmetic number, because the mean of its divisors is an integer number (2783997562970).

Almost surely, 2^{21201212210211} is an apocalyptic number.

21201212210211 is a deficient number, since it is larger than the sum of its proper divisors (12206758545429).

21201212210211 is a wasteful number, since it uses less digits than its factorization.

21201212210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214153658706 (or 214153658703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201212210211 its reverse (11201221210212), we get a palindrome (32402433420423).

Subtracting from 21201212210211 its reverse (11201221210212), we obtain a palindrome (9999990999999).

The spelling of 21201212210211 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, two hundred ten thousand, two hundred eleven".