20012211121211 has 16 divisors (see below), whose sum is σ = 21943216340640. Its totient is φ = 18166334968320.

The previous prime is 20012211121163. The next prime is 20012211121223. The reversal of 20012211121211 is 11212111221002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012211121211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 20012211121211.

It is not an unprimeable number, because it can be changed into a prime (20012211120211) 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, 20965400 + ... + 21899141.

It is an arithmetic number, because the mean of its divisors is an integer number (1371451021290).

Almost surely, 2^{20012211121211} is an apocalyptic number.

20012211121211 is a deficient number, since it is larger than the sum of its proper divisors (1931005219429).

20012211121211 is a wasteful number, since it uses less digits than its factorization.

20012211121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42865534.

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

Adding to 20012211121211 its reverse (11212111221002), we get a palindrome (31224322342213).

The spelling of 20012211121211 in words is "twenty trillion, twelve billion, two hundred eleven million, one hundred twenty-one thousand, two hundred eleven".