20111200312111 has 4 divisors (see below), whose sum is σ = 20246174811000. Its totient is φ = 19976225813224.

The previous prime is 20111200312109. The next prime is 20111200312123. The reversal of 20111200312111 is 11121300211102.

It is a happy number.

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 20111200312111 - 2¹ = 20111200312109 is a prime.

It is a super-3 number, since 3×20111200312111³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111200312711) 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, 67487249221 + ... + 67487249518.

It is an arithmetic number, because the mean of its divisors is an integer number (5061543702750).

Almost surely, 2^{20111200312111} is an apocalyptic number.

20111200312111 is a deficient number, since it is larger than the sum of its proper divisors (134974498889).

20111200312111 is a wasteful number, since it uses less digits than its factorization.

20111200312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134974498888.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 20111200312111 its reverse (11121300211102), we get a palindrome (31232500523213).

The spelling of 20111200312111 in words is "twenty trillion, one hundred eleven billion, two hundred million, three hundred twelve thousand, one hundred eleven".