20011211112111 has 4 divisors (see below), whose sum is σ = 26681614816152. Its totient is φ = 13340807408072.

The previous prime is 20011211112083. The next prime is 20011211112149. The reversal of 20011211112111 is 11121111211002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20011211112111 - 2⁶ = 20011211112047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011211112161) 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 3 ways as a sum of consecutive naturals, for example, 3335201852016 + ... + 3335201852021.

It is an arithmetic number, because the mean of its divisors is an integer number (6670403704038).

Almost surely, 2^{20011211112111} is an apocalyptic number.

20011211112111 is a deficient number, since it is larger than the sum of its proper divisors (6670403704041).

20011211112111 is an equidigital number, since it uses as much as digits as its factorization.

20011211112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670403704040.

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

Adding to 20011211112111 its reverse (11121111211002), we get a palindrome (31132322323113).

The spelling of 20011211112111 in words is "twenty trillion, eleven billion, two hundred eleven million, one hundred twelve thousand, one hundred eleven".