20012111112111 has 8 divisors (see below), whose sum is σ = 26786638999344. Its totient is φ = 13289495316480.

The previous prime is 20012111112083. The next prime is 20012111112113. The reversal of 20012111112111 is 11121111121002.

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

It is not a de Polignac number, because 20012111112111 - 2⁹ = 20012111111599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012111112113) 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, 12978022000 + ... + 12978023541.

It is an arithmetic number, because the mean of its divisors is an integer number (3348329874918).

Almost surely, 2^{20012111112111} is an apocalyptic number.

20012111112111 is a deficient number, since it is larger than the sum of its proper divisors (6774527887233).

20012111112111 is a wasteful number, since it uses less digits than its factorization.

20012111112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25956045801.

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

Adding to 20012111112111 its reverse (11121111121002), we get a palindrome (31133222233113).

The spelling of 20012111112111 in words is "twenty trillion, twelve billion, one hundred eleven million, one hundred twelve thousand, one hundred eleven".