20011202112111 has 24 divisors (see below), whose sum is σ = 31061603412864. Its totient is φ = 11426196645360.

The previous prime is 20011202112107. The next prime is 20011202112113. The reversal of 20011202112111 is 11121120211002.

It is a happy number.

It is not a de Polignac number, because 20011202112111 - 2² = 20011202112107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011202112113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52045845 + ... + 52428926.

It is an arithmetic number, because the mean of its divisors is an integer number (1294233475536).

Almost surely, 2^{20011202112111} is an apocalyptic number.

20011202112111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20011202112111 is a deficient number, since it is larger than the sum of its proper divisors (11050401300753).

20011202112111 is a wasteful number, since it uses less digits than its factorization.

20011202112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104476091 (or 104476084 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20011202112111 its reverse (11121120211002), we get a palindrome (31132322323113).

The spelling of 20011202112111 in words is "twenty trillion, eleven billion, two hundred two million, one hundred twelve thousand, one hundred eleven".