20111111200111 has 8 divisors (see below), whose sum is σ = 21294361859760. Its totient is φ = 18927887664768.

The previous prime is 20111111200051. The next prime is 20111111200127. The reversal of 20111111200111 is 11100211111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111111200111 - 2⁴¹ = 17912087944559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111111200091 and 20111111200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111111000111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5244621 + ... + 8229718.

It is an arithmetic number, because the mean of its divisors is an integer number (2661795232470).

Almost surely, 2^{20111111200111} is an apocalyptic number.

20111111200111 is a deficient number, since it is larger than the sum of its proper divisors (1183250659649).

20111111200111 is a wasteful number, since it uses less digits than its factorization.

20111111200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562153.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 20111111200111 its reverse (11100211111102), we get a palindrome (31211322311213).

The spelling of 20111111200111 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, two hundred thousand, one hundred eleven".