20111011111111 has 4 divisors (see below), whose sum is σ = 20111023370152. Its totient is φ = 20110998852072.

The previous prime is 20111011111099. The next prime is 20111011111153. The reversal of 20111011111111 is 11111111011102.

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 20111011111111 - 2²⁷ = 20110876893383 is a prime.

It is a super-2 number, since 2×20111011111111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

20111011111111 is a modest number, since divided by 11111111 gives 201110 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20111011111091 and 20111011111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111011111211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3203016 + ... + 7105021.

It is an arithmetic number, because the mean of its divisors is an integer number (5027755842538).

Almost surely, 2^{20111011111111} is an apocalyptic number.

20111011111111 is a deficient number, since it is larger than the sum of its proper divisors (12259041).

20111011111111 is a wasteful number, since it uses less digits than its factorization.

20111011111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259040.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 20111011111111 its reverse (11111111011102), we get a palindrome (31222122122213).

The spelling of 20111011111111 in words is "twenty trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, one hundred eleven".