20111212210211 has 4 divisors (see below), whose sum is σ = 21169697063400. Its totient is φ = 19052727357024.

The previous prime is 20111212210151. The next prime is 20111212210223. The reversal of 20111212210211 is 11201221211102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111212210211 - 2⁶ = 20111212210147 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 20111212210211.

It is not an unprimeable number, because it can be changed into a prime (20111212210231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529242426566 + ... + 529242426603.

It is an arithmetic number, because the mean of its divisors is an integer number (5292424265850).

Almost surely, 2^{20111212210211} is an apocalyptic number.

20111212210211 is a deficient number, since it is larger than the sum of its proper divisors (1058484853189).

20111212210211 is a wasteful number, since it uses less digits than its factorization.

20111212210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058484853188.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111212210211 its reverse (11201221211102), we get a palindrome (31312433421313).

The spelling of 20111212210211 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, two hundred ten thousand, two hundred eleven".