20111212011 has 32 divisors (see below), whose sum is σ = 29683351296. Its totient is φ = 12010320000.

The previous prime is 20111211971. The next prime is 20111212013. The reversal of 20111212011 is 11021211102.

It is not a de Polignac number, because 20111212011 - 2³³ = 11521277419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111212013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 688965 + ... + 717561.

It is an arithmetic number, because the mean of its divisors is an integer number (927604728).

Almost surely, 2^20111212011 is an apocalyptic number.

20111212011 is a deficient number, since it is larger than the sum of its proper divisors (9572139285).

20111212011 is a wasteful number, since it uses less digits than its factorization.

20111212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28923.

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

Adding to 20111212011 its reverse (11021211102), we get a palindrome (31132423113).

Subtracting from 20111212011 its reverse (11021211102), we obtain a palindrome (9090000909).

The spelling of 20111212011 in words is "twenty billion, one hundred eleven million, two hundred twelve thousand, eleven".