20111111212 has 24 divisors (see below), whose sum is σ = 35676970560. Its totient is φ = 9917955840.

The previous prime is 20111111191. The next prime is 20111111227. The reversal of 20111111212 is 21211111102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20111111192 and 20111111201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276162 + ... + 341302.

It is an arithmetic number, because the mean of its divisors is an integer number (1486540440).

Almost surely, 2^20111111212 is an apocalyptic number.

It is an amenable number.

20111111212 is a deficient number, since it is larger than the sum of its proper divisors (15565859348).

20111111212 is a wasteful number, since it uses less digits than its factorization.

20111111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66201 (or 66199 counting only the distinct ones).

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

Adding to 20111111212 its reverse (21211111102), we get a palindrome (41322222314).

The spelling of 20111111212 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, two hundred twelve".