20111211201111 has 16 divisors (see below), whose sum is σ = 26843899500000. Its totient is φ = 13393000060928.

The previous prime is 20111211201071. The next prime is 20111211201127. The reversal of 20111211201111 is 11110211211102.

It is a cyclic number.

It is not a de Polignac number, because 20111211201111 - 2⁹ = 20111211200599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111211201131) 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, 54770335 + ... + 55136303.

It is an arithmetic number, because the mean of its divisors is an integer number (1677743718750).

Almost surely, 2^{20111211201111} is an apocalyptic number.

20111211201111 is a deficient number, since it is larger than the sum of its proper divisors (6732688298889).

20111211201111 is a wasteful number, since it uses less digits than its factorization.

20111211201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385698.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 20111211201111 its reverse (11110211211102), we get a palindrome (31221422412213).

Subtracting from 20111211201111 its reverse (11110211211102), we obtain a palindrome (9000999990009).

The spelling of 20111211201111 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, one hundred eleven".