20121111112 has 32 divisors (see below), whose sum is σ = 39887733600. Its totient is φ = 9489049344.

The previous prime is 20121111071. The next prime is 20121111119. The reversal of 20121111112 is 21111112102.

It is a happy number.

It is a super-2 number, since 2×20121111112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121111092 and 20121111101.

It is not an unprimeable number, because it can be changed into a prime (20121111119) 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, 257073 + ... + 326080.

It is an arithmetic number, because the mean of its divisors is an integer number (1246491675).

Almost surely, 2^20121111112 is an apocalyptic number.

It is an amenable number.

20121111112 is a deficient number, since it is larger than the sum of its proper divisors (19766622488).

20121111112 is a wasteful number, since it uses less digits than its factorization.

20121111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583405 (or 583401 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20121111112 its reverse (21111112102), we get a palindrome (41232223214).

The spelling of 20121111112 in words is "twenty billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twelve".