20201211212111 has 16 divisors (see below), whose sum is σ = 20786395824000. Its totient is φ = 19622716482048.

The previous prime is 20201211212101. The next prime is 20201211212141. The reversal of 20201211212111 is 11121211210202.

It is a cyclic number.

It is not a de Polignac number, because 20201211212111 - 2¹⁰ = 20201211211087 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 20201211212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201211212101) 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, 7433111 + ... + 9780263.

It is an arithmetic number, because the mean of its divisors is an integer number (1299149739000).

Almost surely, 2^{20201211212111} is an apocalyptic number.

20201211212111 is a deficient number, since it is larger than the sum of its proper divisors (585184611889).

20201211212111 is a wasteful number, since it uses less digits than its factorization.

20201211212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348578.

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

Adding to 20201211212111 its reverse (11121211210202), we get a palindrome (31322422422313).

The spelling of 20201211212111 in words is "twenty trillion, two hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".