20012112111 has 16 divisors (see below), whose sum is σ = 26842440960. Its totient is φ = 13261655040.

The previous prime is 20012112101. The next prime is 20012112149. The reversal of 20012112111 is 11121121002.

It is not a de Polignac number, because 20012112111 - 2¹³ = 20012103919 is a prime.

It is a super-2 number, since 2×20012112111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750831 + ... + 1762223.

It is an arithmetic number, because the mean of its divisors is an integer number (1677652560).

Almost surely, 2^20012112111 is an apocalyptic number.

20012112111 is a deficient number, since it is larger than the sum of its proper divisors (6830328849).

20012112111 is a wasteful number, since it uses less digits than its factorization.

20012112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14846.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20012112111 its reverse (11121121002), we get a palindrome (31133233113).

It can be divided in two parts, 2001 and 2112111, that added together give a palindrome (2114112).

The spelling of 20012112111 in words is "twenty billion, twelve million, one hundred twelve thousand, one hundred eleven".