20212121110211 has 16 divisors (see below), whose sum is σ = 21774689464320. Its totient is φ = 18706730892960.

The previous prime is 20212121110201. The next prime is 20212121110213. The reversal of 20212121110211 is 11201112121202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212121110211 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 20212121110211.

It is not an unprimeable number, because it can be changed into a prime (20212121110213) 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, 2305001 + ... + 6762933.

It is an arithmetic number, because the mean of its divisors is an integer number (1360918091520).

Almost surely, 2^{20212121110211} is an apocalyptic number.

20212121110211 is a deficient number, since it is larger than the sum of its proper divisors (1562568354109).

20212121110211 is a wasteful number, since it uses less digits than its factorization.

20212121110211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464346.

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

Adding to 20212121110211 its reverse (11201112121202), we get a palindrome (31413233231413).

The spelling of 20212121110211 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred eleven".