20201211111 has 16 divisors (see below), whose sum is σ = 27085536000. Its totient is φ = 13392375360.

The previous prime is 20201211077. The next prime is 20201211113. The reversal of 20201211111 is 11111210202.

It is not a de Polignac number, because 20201211111 - 2⁹ = 20201210599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201211113) 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, 396646 + ... + 444668.

It is an arithmetic number, because the mean of its divisors is an integer number (1692846000).

Almost surely, 2^20201211111 is an apocalyptic number.

20201211111 is a deficient number, since it is larger than the sum of its proper divisors (6884324889).

20201211111 is a wasteful number, since it uses less digits than its factorization.

20201211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48806.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20201211111 its reverse (11111210202), we get a palindrome (31312421313).

Subtracting from 20201211111 its reverse (11111210202), we obtain a palindrome (9090000909).

The spelling of 20201211111 in words is "twenty billion, two hundred one million, two hundred eleven thousand, one hundred eleven".