20201211211111 has 16 divisors (see below), whose sum is σ = 23146291717120. Its totient is φ = 17270951518080.

The previous prime is 20201211211109. The next prime is 20201211211141. The reversal of 20201211211111 is 11111211210202.

It is a cyclic number.

It is not a de Polignac number, because 20201211211111 - 2¹ = 20201211211109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201211211141) 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, 9853135 + ... + 11725471.

It is an arithmetic number, because the mean of its divisors is an integer number (1446643232320).

Almost surely, 2^{20201211211111} is an apocalyptic number.

20201211211111 is a deficient number, since it is larger than the sum of its proper divisors (2945080506009).

20201211211111 is a wasteful number, since it uses less digits than its factorization.

20201211211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876294.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20201211211111 its reverse (11111211210202), we get a palindrome (31312422421313).

Subtracting from 20201211211111 its reverse (11111211210202), we obtain a palindrome (9090000000909).

The spelling of 20201211211111 in words is "twenty trillion, two hundred one billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".