20111211111012 has 48 divisors (see below), whose sum is σ = 53635338193920. Its totient is φ = 5745477256992.

The previous prime is 20111211110971. The next prime is 20111211111029. The reversal of 20111211111012 is 21011111211102.

It is a junction number, because it is equal to n+sod(n) for n = 20111211110982 and 20111211111000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11314008 + ... + 12970319.

It is an arithmetic number, because the mean of its divisors is an integer number (1117402879040).

Almost surely, 2^{20111211111012} is an apocalyptic number.

It is an amenable number.

20111211111012 is an abundant number, since it is smaller than the sum of its proper divisors (33524127082908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111211111012 is a wasteful number, since it uses less digits than its factorization.

20111211111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24294200 (or 24294198 counting only the distinct ones).

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

Adding to 20111211111012 its reverse (21011111211102), we get a palindrome (41122322322114).

The spelling of 20111211111012 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, one hundred eleven thousand, twelve".