20120211111 has 64 divisors (see below), whose sum is σ = 36376574976. Its totient is φ = 9552384000.

The previous prime is 20120211091. The next prime is 20120211113. The reversal of 20120211111 is 11111202102.

It is not a de Polignac number, because 20120211111 - 2⁵ = 20120211079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120211113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 270135 + ... + 336471.

It is an arithmetic number, because the mean of its divisors is an integer number (568383984).

Almost surely, 2^20120211111 is an apocalyptic number.

20120211111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20120211111 is a deficient number, since it is larger than the sum of its proper divisors (16256363865).

20120211111 is a wasteful number, since it uses less digits than its factorization.

20120211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66472.

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

Adding to 20120211111 its reverse (11111202102), we get a palindrome (31231413213).

Subtracting from 20120211111 its reverse (11111202102), we obtain a palindrome (9009009009).

The spelling of 20120211111 in words is "twenty billion, one hundred twenty million, two hundred eleven thousand, one hundred eleven".